A force of 100N was used to kick a football of mass 0.8kg. Find the velocity with which the ball moves if it takes 0.8s to be kicked
From Newton's second law:
\( F = \frac{mV - mµ}{t} \)
Let the final velocity = V; and since the football is initially at rest, its initial vel µ = 0, M = 0.8kg
t = 0.8s
\(\implies 100 = \frac{0.8V - 0.8 \times 0}{0.8}\)
\(\text{Therefore } V = \frac{100 \times 0.8}{0.8} = 100ms^{-1}\)
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