1. A 0.2 kg bullet moving 1000m/s strikes and becomes imbeddedin a 1 kg wooden b
ID: 1701585 • Letter: 1
Question
1. A 0.2 kg bullet moving 1000m/s strikes and becomes imbeddedin a 1 kg wooden block resting on a table. What is their velocity after the collision?A. What type of collision is #1?
2. A 65 kg linebacker moving 10m/s north hits a 50 kg quarterback moving 12m/s south. The linebacker "wraps up" the quarterback and tackles him. What is their combined velocity after the collision?
3. A 500 kg car moving 35 m/s north collides with a 750 kg truck moving 25m/s west. The two vcehickles "stick' together because of the twisted metal. What is their velocity (both speed and direction)after they collide?
Explanation / Answer
Mass of the bullet m = 0.2 Kg
Initial speed of the bullet u1 = 1000 m/s
Mass of the wooden block M = 1 Kg
Initial speed of the block u2 = 0
Let v be the common speed of the bullet and block system after collision.
From law of conservation of momentum
mu1 + Mu2 = (m + M)v
v = [mu1 + Mu2]/(m + M)
= 200/1.2
= 166.66 m/s
It is an ineastic collision.
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