A block of metal weighing 2 kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1 kg/s and a speed of 5 m/s. the initial acceleration of the block will be:

The water jet striking the block at the rate of 1 kg/s at a speed of 5 m/s will exert a force on the blockF = vdmdt = 5× 1 = 5 NUnder the action of this force of 5 N, the block of mass 2 kg will move with an acceleration given bya = Fm= 52 = 2.5 m/s2