A ball is thrown vertically upwards and afterwards allowed to fall back to the point…

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A ball is thrown vertically upwards and afterwards allowed to fall back to the point of projection. Take

g = 9.8\,\text{m s}^{-2}

. (a) The ball is projected with a speed of

20\,\text{m s}^{-1}

. Calculate the time taken to reach its highest point. (b) Determine the maximum height reached by the ball. (c) Find the velocity of the ball

3\,\text{s}

after it is thrown upward. State clearly whether the ball is moving upward or downward at this instant.