Two masses m and 2 m are dropped from heights h and 2h. On reaching the ground, which body will have a greater kinetic energy and why?
Two masses m and 2 m are dropped from heights h and 2h. On reaching the ground, which body will have a greater kinetic energy and why?
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K.E. of first mass, m = P.E. lost by mass m = mgh
K.E. of second mass, 2 m = P.E. lost by mass 2 m
= 2 m × g × 2h = 4 mgh
Therefore, mass 2 m will have 4 times greater kinetic energy on reaching the ground.
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