First slide

Third law

Question

A body of mass 0.25 kg is projected with muzzle velocity 100 $m s^{- 1}$ from a tank of mass 100 kg. What
is the recoil velocity of the tank?

Easy

A

5 $m s^{- 1}$
B

25 $m s^{- 1}$
C

0.5 $m s^{- 1}$
D

0.25 $m s^{- 1}$

Solution

Using law of conservation of momentum, we get
$100 \times v = 0.25 \times 100 \Rightarrow v = 0.25 {ms}^{- 1}$

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