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Question 1

This question is about a bouncy ball, held at rest, 1.3m above the ground.

a)

State the equation linking gravitational potential energy, mass, gravitational field strength, and height.

(0/1 marks)

b)

The mass of the ball is 40 g and is held 1.3 m above the ground.

Calculate the gravitational potential energy of the ball. 

The gravitational field strength on Earth is 9.8 N/kg.

(0/2 marks)

c)

The ball is released and falls to the ground. State the kinetic energy of the ball just before it hits the ground. 

0.51

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(0/1 marks)

d)

Calculate the speed of the ball just before it hits the ground.

Give your answer to 2 decimal places in m/s.

(0/3 marks)

e)

Describe how the student could measure the final speed of the ball, just before it  hits the ground.

(0/4 marks)

f)

Using ideas about forces, explain why the measured value of speed is different to the calculated value. 

(0/4 marks)

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