Question

It takes 1 minute to uplift a 30 kg object to the height of 2 m calculate the power used

Answer 1

Answer: Total kinetic energy

change = 0

So the work done by all forces is equal to zero.

Work done by the force of gravity is = - mgh = - 30 *10*2 = - 600J

[ you might be thinking that why I have placed a negative sign before work done by Gravity the reason is the gravitational force acts in downward direction and displacement is in upward direction so the work done by force should be negative]

Let work done by unknown force be ' x 'J.

Now, x + ( -600 ) = 0

=> X = 600 J

Now, power = work done /time taken

=> Power = 600/( 1*60 )

=> Power = 10 watt.

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