All Problems

Laws of Conservation

Problem 1.125

A body of mass \(m\) is thrown at an angle \(\alpha\) to the horizontal with the initial velocity \(v_{0} .\) Find the mean power developed by gravity over the whole time of motion of the body, and the instantaneous power of gravity as a function of time.

Reveal Answer
P=0,P=mg(gtv0sinα)\langle P\rangle=0, P=m g\left(g t-v_{0} \sin \alpha\right)