Description
a rock falls 30 m. its KE before it strikes the ground is 4,392 J. what is the mass of the rock?
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rock falls from 30 m
at height of 30 m it potential energy =mgh=m*10*30 ( i have taken g=10m/s^2 you can use 9.8)
=300m J
at ground kinetic energy =4392
Potential energy of rock is totally converted kinetic energy
4392=300m
m=14.64 kg
if answer is wrong discusss.
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