List of top Physics Questions on Work-energy theorem asked in AP EAPCET

A block of mass \(2\,\text{kg}\), moving along the \(X\)-axis on a horizontal surface with a speed of \(4\,\text{ms}^{-1}\), enters a rough surface from \(x=0.5\,\text{m}\) to \(x=1.5\,\text{m}\). The retarding force on this rough surface is \[ F=-12x\ \text{N}. \] The speed of the block as it just crosses the rough surface is

A loaded bus and an unloaded bus are both moving with the same kinetic energy. The mass of the former is twice that of the later. Brakes are applied to both so as to exert equal retarding forces. If $S_1$ and $S_2$ are the distances covered by the two buses before coming to rest respectively, then:

A ball of mass \(300\;g\) is dropped from a height \(10\;m\) above a sandy ground. On reaching the ground, it penetrates through a distance \(1.5\;m\) in sand and finally stops. The average resistance offered by the sand to oppose the motion is
Take \(g=10\;\text{m s}^{-2}\).

The ball initially has a velocity of 5 m/s in the positive x-direction and some time later has a velocity of 7 m/s in the positive y-direction. If the work done by the ball is 48 joule, then the mass of the ball in kg is: