In free space, a shell moving with velocity 60 , ,m/s along the p… - Vidyadip

MCQ

In free space, a shell moving with velocity $60\,\,m/s$ along the positive $x-$ axis. When it passes through origin, it explodes into two peices of mass ratio $1 : 2$ . After the explosion, the velocity of the centre of mass is ....... $m/s$.

A
$20$
✓
$60$
C
$90$
D
$0$

✓

Answer

Correct option: B.

$60$

b
As $F_{ext} = 0\,\, so$ $v_{cm} = constant$
$\therefore V_{cm} = 60\,m/s$

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