13. Object X travels across a horizontal surface and collides with object Y. The velocity as a function of time for object X and object Y before, during, and after the collision is shown in the graph. Both objects have a mass of 2 kg. Which of the following correctly describes the momentum p of the system and the kinetic energy KE of the system? * 5 Object X o Object Y 4 ... 3 o o -2수 ㅇ -3 0.2 0.4 0.6 Time (s) 0.8 1.0 (A) p is conserved KE is conserved (B) p is conserved KE is not conserved (C) p is not conserved KE is conserved (C) p is not conserved KE is not conserved Velocity (m/s)

A basketball (m=0.60 kg) is dropped from rest. Just before striking the floor, the ball has a momentum whose magnitude is 3.1 kg-m/s. At what height was the basketball dropped? i

3: A rail engine weighs four times as much as a freight car. The engine coasts at 7 km/h into afreight car that was already coasting in the opposite direction at 1 km/h. The freight car’s mass is1000.00 kg. The engine couples together with the freight car.a) Find the initial total momentum of the (engine + freight car) system.b) What was the total kinetic energy of the system? (For KE it does not matter whether an object ismoving to the right or to the left.)c) Find the velocity of the (engine + freight car) system after they couple together.d) What is the final kinetic energy of the system? (The answer may be different from that in part B)

1. An apple that weighs 2.7 N falls vertically downward from rest for 1.4 s. (a) What is the change in the apple’s momentum per second? (b) What is the total change in its momentum during the 1.4-second fall?Explain and lable the problem.

Kara Moore was applying make up in the parking lot. Unaware that Lisa's car was stopped in her lane 30 ft ahead. Kara rear ended Lisa's car. Kara's car was 1300 kg and was moving at 11 m/s and completely stopped after hitting Lisa's car in 0.14 sec. What is the net impulse experienced by Kara's car.

Hi , this is a problem from my homework which I would love to have help with the steps to figure it out.  One object moves in the positive ? direction with speed ?. Another object moves in the opposite direction with the same speed, but with one‑fourth the mass of the first object. The two objects have a completely inelastic collision. What is the final ? component of the velocity? ?/2 ? 3?/5 ?3 0

11.

A football player kicks a 4.7 N football and gives it a velocity of 21 m/s starting from rest.  The contact between the foot and the ball lasts 1/60 s. Calculate the momentum involved in this impact. Include magnitude and direction when reporting vectors.

A rubber ball with a mass of 0.115 kg is dropped from rest. From what height (in m) was the ball dropped, if the magnitude of the ball's momentum is 0.780 kg m/s just before it lands on the ground? m

Objects A and B collide in an isolated system. The vector arrows represent the before- and after-collision momentum of objects A and B. Which vector represents the momentum of object B after the collision? Before Collision After Collision рв PA Рв 3D ??? PA B D рв Рв Рв рв G н Рв Рв Рв рв ↑