(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. (a) What type(s) of energy is (are) changing? Is each type increasing or decreasing? Why?

2. Relevant equations

Power=Work/Time

Work=Change in KE

3. The attempt at a solution

a) I would think that potential and kinetic energy are both changing; both increase because the helicopter gains altitude (increasing PE) and increases velocity (increasing KE). Is this correct? I know that in a situation where energy is conserved, one must decrease as the other one increases. I'm not sure whether this qualifies as an energy-conservative situation, though.

b) The work-energy theorem. The work done by gravity + work done by helicopter = change in KE. Is this correct?

Many thanks!

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# Homework Help: Can kinetic energy and potential energy both increase?

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