Paper 1 (2)

The acceleration of free fall on the Moon is 1.6 m s^-1 . The Moon has no atmosphere. An astronaut standing on the surface of the Moon drops a feather.

Which graph shows the variation with time of the speed of the feather during the first second of its fall?

• A

• B

• C

• D

A tennis ball is released from rest at the top of a tall building.

Which graph best represents the variation with time t of the acceleration a of the ball as it falls, assuming that the effect of air resistance is not negligible?

• A

• B

• C

• D

The graph shows how the velocity v of an object moving in a straight line varies with time t from t = 0 to t = T.

• A

• B

• C

• D

A ball falls vertically onto horizontal ground and rebounds, as shown.

The ball has momentum p₁ downwards just before hitting the ground. After rebounding, the ball leaves the ground with momentum p₂ upwards. The ball is in contact with the ground for 0.020 s. During this time interval, an average resultant force of 25 N acts on the ball.

What is a possible combination of values for p₁ and p₂?

• p₁ = 0.15 kg m s^-1, p₂ = 0.65 kg m s^-1

• p₁ = 0.20 kg m s^-1, p₂ = 0.30 kg m s^-1

• p₁ = 0.30 kg m s^-1, p₂ = 0.20 kg m s^-1

• p₁ = 0.65 kg m s^-1, p₂ = 0.15 kg m s^-1

A sphere falls from rest through the air. The graph shows the variation with time of the sphere’s velocity.

• A

• B

• C

• D