$A$ football is kicked into the air vertically upwards. What is its $(a)$ acceleration and $(b)$ velocity at the highest point?
(N/A) When a football is kicked vertically upwards,it moves under the influence of gravity alone (ignoring air resistance).
$(a)$ At the highest point,the football is momentarily at rest before it starts moving downwards. However,the gravitational force continues to act on it. Therefore,its acceleration is equal to the acceleration due to gravity,$g \approx 9.8 \ m/s^2$,directed vertically downwards.
$(b)$ At the highest point,the football momentarily stops before changing its direction of motion. Therefore,its velocity at the highest point is $0 \ m/s$.
$(a)$ At the highest point,the football is momentarily at rest before it starts moving downwards. However,the gravitational force continues to act on it. Therefore,its acceleration is equal to the acceleration due to gravity,$g \approx 9.8 \ m/s^2$,directed vertically downwards.
$(b)$ At the highest point,the football momentarily stops before changing its direction of motion. Therefore,its velocity at the highest point is $0 \ m/s$.
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