P = mgh / t

P ‘ = mg 2h / [ t/2 ] = 4 mgh / t = 4 P

4 times

We know that

Power = workdone / time

= m g h /

t

Now

P ‘ = m g h’ / t’

Given that h’ = 2 h

t’ = t / 2

Therefore

P ‘ = m g 2h / t/2

= 4

m g h / t

= 4

P

Therefore power increases by four times of intial power

general formula–>P = mgh / t

changed power P ‘ = mg 2h / [ t/2 ] = 4 mgh / t = 4 P

hence,factor must be increased by factor 4.

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