A billiard ball collides with a stationary identical billiard ball in an elastic head-on collision. After the collision, which of the following is true of the first ball? A a. It maintains its initial velocity. b. It has one-half its initial velocity. c. It comes to rest. d. It moves in the opposite direction. E E. No answer

Q14. Two cars of equal mass, one travelling north, the other east, collide at the same speed at right angles to each other. Assuming the collision is perfectly inelastic, what is the velocity following the collision? a. Ö2 times initial speed, at 45° east of south b. 1//2 times the initial speed, at 45° east of north Ос. twice the initial speed, at 45° east of south d. Ö2 times initial speed, at 45° east of north

K Solve for the indicated variable. Assume all variables are positive. QV₁ QV₂ T. L T₂ ; for T₁ (Simplify your answer.)

A 2.0-kg cart moving to the right with a speed of 1.0 m/s has a head-on collision with a 4.0-kg cart that is initially moving to the left with a speed of 1.5 m/s. After the collision, the 2.0-kg cart is moving to the left with a speed of 0.5 m/s. What is the final velocity of the 4.0-kg cart? a) zero m/s Ob) 1.5 m/s to the right c) 1.5 m/s to the left d) 0.75 m/s to the right e) 0.75 m/s to the left

Two particles with different initial momentum collide and stick to each other. Compared to before the collision, the system of two objects after the collision has? Explain.  A. Less total momentum and less kinetic energy B. Less total momentum but the same amount of total kinetic energy. C. Not enough information is given to decide. D. The same amount of total momentum and the same total kinetic energy. E. The same amount of total momentum, but less total kinetic energy.

b. A 1200-kg car moving with a velocity VA = 25.0 m/s i crashes into the back of a 9000-kg truck moving at a velocity VB of 20.0 m/s i. The velocity of the car immediately after the collision is 18.0 m/s i. i. what is the velocity of the truck immediately after the collision ( to the nearest integer) ii. the coefficient of restitution between them. What type of collision is this? iii. the change in mechanical energy of the car-truck system in the collision. How do you account for the change in mechanical energy?

A 15-kg green bowling ball moving eastward initially with a speed of 2.0 m/s makes an elastic head-on collision with a 9.0-kg red bowling ball that is moving westward at 3.0 m/s. Determine the final velocities of each bowling ball right after the collision.

A coin that is tossed straight up into the air. After it is released, it moves upward, reaches its highest point and falls back down again. Use one of the following choices (A through G) to indicate the acceleration of the coin during each of the stages of the coin's motion described below. Take up to be the positive direction. Answer choice J if you think that none is correct. A. The acceleration is in the negative direction and constant. B. The acceleration is in the negative direction and increasing. C. The acceleration is in the negative direction and decreasing. D. The acceleration is zero. E. The acceleration is in the positive direction and constant. F. The acceleration is in the positive direction and increasing. G. The acceleration is in the positive direction and decreasing. The coin is mo downward. OE OF OJ O C O A OD OG O B

13) A 14.2 kg sheep dog is running to the right at 1.78 m/s. A 10.7 kg collie is running to the left at 2.14 m/s. If the dogs collide head-on in a perfectly elastic collision, what is the final velocity of the collie after the collision? A) 4.43 m/s B) 2.34 m/s C) 1.73 m/s D) 1.27 m/s E) 2.08 m/s

I.  A lump of clay (m = 3.01 kg) is thrown towards a wall at speed v = 3.15 m/s.  The lump sticks to the wall.  (a) What kind of collision is it?  Is momentum conserved during this collision?  Why or why not? (b) Calculate the impulse imparted on the lump by the wall. (c) Calculate percent of initial kinetic energy lost during this collision.   II.  Same lump is thrown towards the same wall, but this time it bounces off the wall at speed of 3.15 m/s. (a) What kind of collision is it?  Is momentum conserved during this collision?  Why or why not? (b) Calculate the impulse imparted on the lump by the wall. (c) Calculate percent of initial kinetic energy lost during this collision.   III.  Same lump is thrown towards the same wall, but this time it bounces off the wall at speed of 2.24 m/s. (a) What kind of collision is it?  Is momentum conserved during this collision?  Why or why not? (b) Calculate the impulse imparted on the lump by the wall. (c) Calculate percent of initial kinetic…