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|6.7||Law of Conservation of Momentum and Kinetic Energy|
1) Two identical billiard balls move towards each other at 4 m/s and 1 m/s respectively as shown in the figure.
After a head-to-head collision, the first ball moves at 2 m/s in the same direction as prior to the collision. What is the velocity of the second ball after the collision?
Correct Answer: D
2) A 2 t freight car is disconnected from its locomotive and stars moving slightly downhill at 1.2 m/s. It collides with another 3 t freight car at rest and afterwards, they move together.
What is the common velocity of the two freight cars after the collision? (1 t = 1000 kg)
Correct Answer: A
3) A 40 g bullet moving horizontally at 400 m/s hits horizontally a 2960 g wooden block initially at rest. After the bullet is stuck on the wooden block, the system moves together along a horizontal surface whose friction coefficient is 0.4. How far can the system move in these conditions? For convenience, take g = 10 m/s2.
Correct Answer: C
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