Question

A football is kicked into the air vertically upwards with velocity $u$. The velocity of the ball at the highest point is:

• A. $u$
• B. $2u$
• C. $zero$
• D. $4u$

Answer 1

Answer: (C)

$zero$

When football is kicked upwards in air

net acceleration of the football is given by

$F=mg$

$a=\frac{F}{m}$

$a=\frac{mg}{m}=g=9.8m/s^2$

now as it moves up its velocity will decrease due to gravity which acts opposite to the motion.now as the ball moves high velocity continuously decreases and finally velocity will become $ZERO$ as it will reach the highest point.

so the velocity of football at the top position will be $ZERO$