Please help me int the following quesitons.

Asked by  | 7th Mar, 2013, 11:16: AM

Expert Answer:

A man of mass 62kg
climbs up a stair case of 65 steps ,height of each step is 20cm,
time 12s.
his power=P=mgh/t

2)The kinetic energy of an object moving with a velocity of 5m/s is 25J.
1/2 mx 5x5=25
What will be its kinetic energy when its velocity is made (i)two times (ii)three times?
as KE is proportional to square of vel, so :

its velocity is made (i)two times, KE will be 4 times.
  (ii)three times: then KE will be 9 times.            

Answered by  | 7th Mar, 2013, 11:31: AM

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