A-LevelPhysicsDynamics9702/12 · Oct/Nov 2020 · Q91 Mark

An object falls from a tall building. The graph shows how the velocity of the object changes with time t. [Figure 9.1] The acceleration of free fall is g. What describes the acceleration of the object at times t = Y and t = Z?

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Aacceleration at t = Y: decreasing, acceleration at t = Z: g

Bacceleration at t = Y: decreasing, acceleration at t = Z: 0

Cacceleration at t = Y: constant, acceleration at t = Z: g

Dacceleration at t = Y: constant, acceleration at t = Z: 0

✓ Correct answer

B: acceleration at t = Y: decreasing, acceleration at t = Z: 0

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