Question

a ball of mass 2kg is droped from the tower of 80m to a wooden floor and rebound to the same height . Find change in momentum of the ball.

Answer 1

Answer:

change in momentum will be 160 kgm/s^2

Explanation:

velocity when ball will strike to the floor

then

v=sqrt{2gh}

v=sqrt{2×10×80}

v=40m/s

in downward direction

velocity just after strike will be 40 because

it will attain same height so collision is perfectly elastic

so change in momentum

∆P=mv-(-mv)

∆P=2mv

∆P=2×2×40

=160kgm/s^2