Question

1.Imagine two balls colliding on a billiard table that is frictionless. Decide which statement is correct and explain why:(a) The total momentum of the system that contains only one of the two balls is the same before and after the collision.(b) The total momentum of the system that contains both of the two balls is the same before and after the collision.

2.One object is at rest, and another is moving. The two collide in one-dimensional, completely inelastic collision. In other words, they stick together after the collision and move off with a common velocity. Momentum is conserved. The speed of the object that is moving initially is 25 m/sec. The masses of the two objects are 3.0 kg and 8.0 kg. Determine the final speed of the two-object system after the collision for the case when the large-mass object is the one moving initially and the case when the small –mass object is the one moving initially.

3.A car accelerates uniformly from rest to 20.0 m/sec in 5.6 sec along a level stretch of road. Ignoring friction, determine the average power required to accelerate the car if (a) the weight of the car is 9000 N (b) weight of the car is 14000 N.

Answer 1

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