Question

A 6 kg chemistry tube, which is at rest on a smooth plane,fragments into two pieces of masses 2 kg and 4 kg after an internal explosion.If the 2 kg piec moves due west at a velocity of 10 m/s after the explosion, what is the velocity of the other pieces ?

Answer 1

$m_{1}$=2 kg, $m_{2}$=4 kg, $v_{1}$=10 m/s;
$m_{1}$$v_{1}$=$m_{2}$$v_{2}$;
$v_{2}$=$m_{1}$$v_{1}$:$m_{2}$=10×2/4=5 m/s.