A moving body of mass $m$ and velocity $3 \,km/h$ collides with a rest body of mass $2\,m$ and sticks to it. Now the combined mass starts to move. What will be the combined velocity ............ $km/h$
A moving body of mass $m$ and velocity $3 \,km/h$ collides with a rest body of mass $2\,m$ and sticks to it. Now the combined mass starts to move. What will be the combined velocity ............ $km/h$
$3$
$2$
$1$
$4$
A moving body of mass $m$ and velocity $3 \,km/h$ collides with a rest body of mass $2\,m$ and sticks to it. Now the combined mass starts to move. What will be the combined velocity ............ $km/h$
Initial momentum = $m \times 3 + 2m \times 0 = 3m$
Final momentum = $3m \times V$
By the law of conservation of momentum$3m = 3m \times V$
==> $V = 1\;km/h$
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