A-LevelPhysicsKinematics9702/12 · Oct/Nov 2015 · Q71 Mark
A boy throws a ball vertically upwards. It rises to a maximum height, where it is momentarily at rest, and then falls back to his hands. Which row gives the acceleration of the ball at various stages in its motion? (Take vertically upwards as positive. Ignore air resistance.)
Arising: -9.81 ms⁻², at maximum height: 0, falling: +9.81 ms⁻²
Brising: -9.81 ms⁻², at maximum height: -9.81 ms⁻², falling: -9.81 ms⁻²
Crising: +9.81 ms⁻², at maximum height: +9.81 ms⁻², falling: +9.81 ms⁻²
Drising: +9.81 ms⁻², at maximum height: 0, falling: -9.81 ms⁻²
✓ Correct answer
B: rising: -9.81 ms⁻², at maximum height: -9.81 ms⁻², falling: -9.81 ms⁻²
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