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a ball of mass 0.2 kg rests on a vertical post of length 5m. a bullet of mass 0.01 kgtravelling with a vel v m/s in horizonal direction,hits center of ball after collision bullet and ball travell seperately ball hits ground at dist of 20m from post and bullet at 100m from post then find initial velocity of the bullet? A)250 B)250*(2)^1/2 C)400 D)500
a ball of mass 0.2 kg rests on a vertical post of length 5m.
a bullet of mass 0.01 kgtravelling with a vel v m/s in horizonal direction,hits center of ball
after collision bullet and ball travell seperately
ball hits ground at dist of 20m from post and bullet at 100m from post
then find initial velocity of the bullet?
A)250
B)250*(2)^1/2
C)400
D)500
D- The question is about conservation of momentum
Assume the ball and the bullet after collision travelled their respective distances in 1sec, which makes there speed 20m/s and 100m/s.
You can calculate the momentum for each of them using the formule p=mv
0.2*20=4kgm/s
0.01*100=1kgm/s
Add the momentums (4+1=5) and that is the transferred by the bullet.
And now you can find out the velocity because you have the mass and momentum of the bullet at the start.
p=mv
v=5/0.01
v=500m/s
Thank you
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