First slide

Second law

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

Easy

A

2.5 m/s²
B

5 m/s²
C

10 m/s²
D

5 m/s

Solution

Initial acceleration = $= \frac{vdm / dt}{M} = \frac{(5) (1)}{2} = 2 .5 m / s^{2}$

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