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CBSE Class 9 Answered

a man drops a 10kg rock from the top of a ladder. what is its speed just before it hits the ground? what is ita kinetic energy when it reaches the ground? (take g=10m/s-2)
Asked by | 30 Dec, 2011, 12:00: AM
answered-by-expert Expert Answer
KE when it reaches the ground= initial PE
                                            =mgh=100h  if you dont know the height then you cannt find out the KE.
apply:v2=u2+2gh =2gh=20 h
Answered by | 02 Jan, 2012, 11:56: AM

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