Question

A football of mass 0.5 kg is kicked by a player with a velocity of 5 m/s before reaching to another player of his team. He returns it by kicking along its original path with a velocity 6 m/s. Calculate the magnitude of change in linear momentum of the footbal due to the second kick.

Answer 1

$\fbox\blue{Initial~momentum~=~mu}$

${\sf\bold{mass~=~0.5~kg}}$

${\sf\bold{Initial~velocity~=~5m/s}}$

${\sf\bold{5~×~0.5}}$

${\sf\bold{Initial~momentum~=~2.5~m/s}}$

$\fbox\blue{Final~momentum~=~mv}$

${\sf\bold{Final~velocity~=~6m/s}}$

${\sf\bold{mass~=~0.5~kg}}$

${\sf\bold{6~×~0.5}}$

${\sf\bold{Final~momentum~=~3m/s}}$

$\large{\sf{Linear~momentum~→}}$$\boxed{\fcolorbox{white}{white}{mv~-~mu}}$

${\sf\bold{-3~-~2.5}}$

$\pink{\sf\bold{=~-5.5}}$