A bullet of mass m/5 moving horizontally with velocity v collides against a pendulum bob of mass m and gets embedded in it. The maximum height reached by the pendulum-bullet system is
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momentum before collision = momentum after collision
mVo=2mV
V=Vo/2
By energy conservation
1/2 * (2m) * (Vo2)^2=2mgh
h=(Vo)^2/8g
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