Work, Energy and Power

A body of mass $M$ is moving with a uniform speed of $10 \mathrm{~m} / \mathrm{s}$ on frictionless surface under the influence of two forces $F_1$ and $F_2$. The net power of the system is

A ball is allowed to fall from a height of \(10 \mathrm{~m}\). If there is \(30 \%\) loss of energy due to impact, then after one impact ball will go up to.

A particle of mass \(m\) is moving in a horizontal circle of radius \(r\) under a centripetal force given by \(\left(-k / r^2\right)\), where \(k\) is a constant. Then

A toy gun uses a spring of force constant \(k\). When charged before being triggered in the upward direction, the spring is compressed by a distance \(x\). If the mass of the shot is \(m\), on being triggered it will go upto a height of

The power \((P)\) of an engine lifting a mass of \(100 \mathrm{~kg}\) upto a height of \(10 \mathrm{~m}\) in \(1 \mathrm{~min}\) is