A block of metal wheighing 2 kg is resting on a frictionless surface,if struck by a jet releasing water at the rate of 1kg/s and at a speed of 5m/s.what is the initial acceleration of the block ?
The final velocity of mass of water after hitting the metal block is zero.
So the average change in momentum per sec = initial momentum
As this change in momentum occurs during 1 sec. We may say that the force exerted on the 2kg metal block is
Hence by Newton's law initial acceleration of the block of mass