First slide

Third law

Question

The rate of mass of the gases emitted from rear of a rocket is initially $0 .1 {kgs}^{- 1}$ . If the speed of the gas relative to the rocket is 50 m/s and mass of the rocket is 2 kg, then the acceleration of the rocket is

Moderate

A

5
B

5.2
C

2.5
D

25

Solution

As $a = \frac{Δv}{Δt} = \frac{v}{m} \cdot \frac{Δm}{Δt}$
$= \frac{50}{2} \times 0 .1 = 2 .5 {ms}^{- 2}$

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