Question

A ball of mass 5 kg fall from a height of 40 m find with what velocity it will hit the ground.

Answer 1

here we can use work energy theorem,
therefore,
work done by gravity=change in kinetic energy.
m*g*s=1/2mv^2-0
because initial velocity is zero.
5*10*40=1/2*5*v^2
therefore,
400*2=v^2

sqrt(800)=v
is the answer.
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