Question

A ball of mass 1kg is dropped from a height of 5m onto a plane it then bounces to a height of 1.8 m calculate the loss in kinetic energy

Answer 1

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So sorry for any mistakes

Potential energy is zero at ground

then
potential energy at height 5m = mg = 1×10 = 10J

so ,
kinetic energy at ground = 10J
according to energy conversation law

so,
1/2mv^2 = 10
v^2 = 20

v = root 20 m/s

Thanks