A-LevelPhysicsDynamics9702/12 · May/June 2025 · Q71 Mark

A solid object of mass 1.0 kg falls vertically downwards in a vacuum. When the speed of the object is 60 ms¯¹, an additional constant force of 50 N suddenly starts to act vertically upwards on the object. What is the speed of the object 2.0 s after the additional force starts to act?

A20 m s-1

B40 m s-1

C80 m s-1

D100 m s-1

✓ Correct answer

A: 20 m s-1

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