First slide

Second law

Question

A gun is mounted on a vehicle which is at rest on a frictionless road. Mass of vehicle + gun is 1600 kg. The gun fires 20 bullets per sec, each with a velocity 400 m/s. Mass of each bullet is 20 gm. Acceleration produced in the vehicle is:

Easy

A

12 cm/s²
B

14 cm/s²
C

8cm/s²
D

10 cm/s²

Solution

Acceleration produced $= \frac{vdm / dt}{m}$
$= \frac{(400) (20 \times 10^{- 3}) (20)}{1600} = 0 .1 m / s^{2}$

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