MIDDLESEX COUNTY COLLEGE EDISON, NJ 08818 Chapter: 5,6 PHY 101 Date: October 24,
ID: 1785832 • Letter: M
Question
MIDDLESEX COUNTY COLLEGE EDISON, NJ 08818 Chapter: 5,6 PHY 101 Date: October 24, 2017 Q.1 17500 kg railroad car travelling 8 m/s to the east collides and couples with a stopped 22500 kg railroad car. What is the velocity of the joined cars after the collision? Q.2 A 1500kg starts from rest at the top of a 9m long driveway that is inclined at 30o with the horizontal. Show this in a rough sketch. If an average friction force of 3000N impedes the motion, find the speed of the car at the bottom of the driveway Q. 3 A ball of mass 0.25 kg is dropped rom rest from a height of 3 m. It rebounds from the floor to reach a height of 1 m. What impulse was given to the ball by the floor?Explanation / Answer
Q.1) From the law of conservation of linear momentum
Initial momentum = final momentum
17500 × 8 = (17500+22500) × v
So v = 3.5 m/s towards east.
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