Question

A mass is raised vertically. In time t, the increase in its gravitational potential energy is Ep and the increase in its kinetic energy is Ek. What is the average power input to the mass?

Answer 1

Answer:

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Answer 2

The average power input to the mass is :- P = (Ek + Ep) / t

increase in gravitational potential energy = Ep

Increase in kinetic energy = Ek

Time taken = t

.) Now,let total gravitational energy be 'E'.

We know that total gravitaional energy is the sum of potential energy and kinetic energy .

.) Now, mathemarically ,

E = Ep + Ek

Now , let 'P' be the power input of mass .

.) We know that power = Energy/ time

Now, according to the question

P = E / t

P = ( Ek + Ep ) / t