Question

A Stationary Shell Of Mass 7 Kg Explodes Into Two Fragments Of Masses 2 Kg And 5 Kg. The Lighter Fragment Flies Off With A Speed Of 700 With Respect To The Heavier Fragment. The Speed Of The Heavier Fragment Is.______ A) 200J B) 150J C) 300J D) 600J

Answer 1

Given that,

Mass of shell = 7 kg

Mass of light fragment = 2 kg  

Mass of heavier fragment = 5 kg

Speed of light fragment = 700 m/s

We need to calculate the speed of heavier fragment

Using conservation of momentum

$MV=m_{1}v_{1}+m_{1}v_{2}$

Put the value into the formula

$0=2\times700-5v_{2}$

$v_{2}=\dfrac{2\times700}{5}$

$v_{2}=280 m/s$

Hence, The speed of heavier fragment is 280 m/s.