Work Energy And Power - Mechanics - Physics Previous Year Questions

A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time \(t\) is proportional to

A smooth chain of length \(2 \mathrm{~m}\) is kept on a table such that its length of \(60 \mathrm{~cm}\) hangs freely from the edge of the table. The total mass of the chain is \(4 \mathrm{~kg}\). The work done in pulling the entire chain on the table is (Take, \(g=10 \mathrm{~m} / \mathrm{s}^2\))

A ball of mass \(0.2 \mathrm{~kg}\) is thrown vertically down from a height of \(10 \mathrm{~m}\). It collides with the floor and loses \(50 \%\) of its energy and then rises back to the same height. The value of its initial velocity is

A particle of mass 500 g is at rest. It is free to move along a straight line. The power delivered to the particle varies with time according to the following graph

The momentum of the particle at $t=5$ s is

A body of mass 0.25 kg travels along a straight line from $x=0$ to $x=2 \mathrm{~m}$ with a speed $v=k x^{3 / 2}$ where $k$ $=2 \mathrm{SI}$ units. The work done by the net during this displacement is