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OpenStudy (anonymous):
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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OpenStudy (shamim):
Given h=30m K.E=4392J m=?
OpenStudy (shamim):
At 30m height the potential energy is P.E=mgh
OpenStudy (shamim):
Before touching the ground kinetic energy is K.E=mgh 4392=m*9.8*30
OpenStudy (shamim):
m=?
OpenStudy (shamim):
Response plz!!"
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OpenStudy (anonymous):
146kg
OpenStudy (shamim):
No
OpenStudy (shamim):
m=4392/(9.8*30)=?
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