Question

a block of mass 5kg is at rest on a smooth horizontal surface.wter coming out of pipe horizontally at the rate 2 kg s, hits the block with a velocity of 6 ms.the initial acceleration of the block is?

Answer 1

Given,

m = 5 kg

rate of water (dm/dt) = 2 kg/sec

We know that,

$F = v \frac{dm}{dt} \\ \\ F = 6 \times 2 \\ \\ F = 12 N \textbf{According to newton's second law} \\ \\ F = ma \\ 12 = 5 \times a \\ \\ a =2.4 \ m\sec^{2}$

Answer 2

Answer:

the answer is 2.4 m/s^-2