Question

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/sec and at a speed of 5 m/sec. The initial acceleration of the block will be:

• A. 2.5 $m/se{c}^2$
• B. 5.0 $m/se{c}^2$
• C. 10 $m/se{c}^2$
• D. None of the above

Answer 1

The correct option is A 2.5 $m/se{c}^2$

Force =rate of change in mass$\times$ speed

F=$1\times 5=5$N=ma

a=2.5$\frac{m}{se{c}^2}$