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AS Mechanics · Edexcel 8MA0 · free A-level maths worksheet

Vertical motion under gravity

Objects thrown up or dropped, g = 9.8, greatest height, time of flight, speed on hitting the ground.

12 original questions, 68 marks. Print the worksheet, mark it with the answers sheet, and use the solutions to see every step written out by hand.

Worksheet PDFWorked solutions PDFAnswers PDF

The questions

1

A stone is dropped from rest from a bridge 20 m above a river. The stone is modelled as a particle moving freely under gravity.

  1. Find the time taken for the stone to reach the river.
  2. Find the speed of the stone as it hits the water.

Take g = 9.8 m s−2.

4 marks
Show answer
a) 2.02 s b) 19.8 m s-1
2

A ball is thrown vertically upwards from ground level with speed 14.7 m s−1. The ball is modelled as a particle moving freely under gravity.

  1. Find the greatest height reached by the ball.
  2. Find the total time the ball is in the air.

Take g = 9.8 m s−2.

4 marks
Show answer
a) 11.0 m b) 3 s
3

A ball is projected vertically upwards with speed 21 m s−1 from a point P. The ball is modelled as a particle moving freely under gravity.

For the instant 3 s after projection,

  1. find the speed of the ball and state whether it is moving up or down,
  2. find the height of the ball above P.

Take g = 9.8 m s−2.

4 marks
Show answer
a) 8.4 m s-1, moving downwards b) 18.9 m
4

A stone is thrown vertically downwards with speed 5 m s−1 from the top of a cliff. It hits the sea 3 s later. The stone is modelled as a particle moving freely under gravity.

  1. Find the height of the cliff above the sea.
  2. Find the speed of the stone as it hits the sea.

Take g = 9.8 m s−2.

4 marks
Show answer
a) 59.1 m b) 34.4 m s-1
5

A small ball is projected vertically upwards from a point A. The greatest height of the ball above A is 8.1 m. The ball is modelled as a particle moving freely under gravity.

  1. Find the speed of projection.
  2. Find the time taken for the ball to return to A.

Take g = 9.8 m s−2.

4 marks
Show answer
a) 12.6 m s-1 b) 2.57 s
6

A ball is projected vertically upwards from ground level with speed 19.6 m s−1. The ball is modelled as a particle moving freely under gravity.

Find the length of time for which the ball is at least 14.7 m above the ground.

Take g = 9.8 m s−2.

5 marks
Show answer
2 s
7

A girl throws a ball vertically upwards with speed 12 m s−1. The ball leaves her hand 2 m above the ground. The ball is modelled as a particle moving freely under gravity.

  1. Find the time taken for the ball to hit the ground.
  2. Find the speed of the ball as it hits the ground.

Take g = 9.8 m s−2.

6 marks
Show answer
a) 2.61 s b) 13.5 m s-1
8

A stone is released from rest at the top of a well and falls freely to the water at the bottom. In the last second of its fall the stone travels 24.5 m.

  1. Find the total time for which the stone falls.
  2. Find the depth of the water below the point of release.

Take g = 9.8 m s−2.

6 marks
Show answer
a) 3 s b) 44.1 m
9

A small stone is projected vertically upwards with speed 14 m s−1 from the top of a tower. The top of the tower is 40 m above horizontal ground. The stone falls past the tower and lands on the ground. The stone is modelled as a particle moving freely under gravity.

  1. Find the greatest height of the stone above the ground.
  2. Find the time from projection until the stone hits the ground.
  3. State one limitation of the model that could affect your answer to part (b), and say how.

Take g = 9.8 m s−2.

8 marks
Show answer
a) 50 m b) 4.62 s c) air resistance is ignored; with air resistance the stone would not rise as high and would take a different (longer) time to fall, or the stone has size and so is not a particle
10

A ball is dropped from rest from a height of 2.5 m above a horizontal floor. It hits the floor and rebounds vertically upwards with half the speed it had just before impact. The ball is modelled as a particle moving freely under gravity, and the time in contact with the floor is ignored.

  1. Find the speed of the ball just before it hits the floor.
  2. Find the greatest height reached by the ball after its first bounce.
  3. Find the time from release until the ball reaches this greatest height.

Take g = 9.8 m s−2.

7 marks
Show answer
a) 7 m s-1 b) 0.625 m c) 1.07 s
11

A ball A is dropped from rest from a window 30 m above the ground. At the same instant a second ball B is projected vertically upwards from the ground directly below the window with speed 15 m s−1. The balls move in the same vertical line and are modelled as particles moving freely under gravity.

  1. Find the time at which the balls collide.
  2. Find the height above the ground at which they collide.
  3. Find the velocity of B just before the collision, and state whether B is moving up or down.

Take g = 9.8 m s−2.

7 marks
Show answer
a) 2 s b) 10.4 m c) 4.6 m s-1 downwards
12

A cricket ball is hit vertically upwards from a point 1.5 m above the ground. It hits the ground 3.2 s later. The ball is modelled as a particle moving freely under gravity.

  1. Find the speed with which the ball was hit.
  2. Find the greatest height of the ball above the ground.
  3. Find the length of time for which the ball is more than 10 m above the ground.
  4. State one way in which the model could be refined.

Take g = 9.8 m s−2.

9 marks
Show answer
a) 15.2 m s-1 b) 13.3 m c) 1.64 s d) include air resistance (or model the ball's size and spin)

Every question here is original and written by Robinson Tuition. It follows the Edexcel AS specification and suits AQA and OCR AS maths too; this is not an exam-board paper.

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