A ball of mass 0.2 Kg rests on a vertical post of height 5m a bullet of mass 0.01 kg travelling with a Velcoity V hits the centre of ball in Horizontal after the collision the ball hit the ground at 20m and bullet at 100m find initial velocity of bullet?

Question

anonymous · Answer

MV = m1u + Mu2

anonymous · Answer

assuming elastic collision
call ball - M , bullet - m
conservation of momentum :
m*V = M * u +  m * U

anonymous · Answer

Yup...i got it.....a fatal Mistake in my cal made me to post this question i am so silly..)

anonymous · Answer

now we know time to fall 5m is given by 
5 = gt^2 / 2

anonymous · Answer

oh so you found the answer? :)