Car A rear ends Car B, which has twice the mass of A, on an icy ...

[kshipps]

Car A rear ends Car B, which has twice the mass of A, on an icy road at a speed low enough so that the collision is essentially elastic. Car B is stopped at a light when it is struck. Car A has mass m and speed v before the collision. After the collision
 a. each car has half the momentum.
  b. car A stops and car B has momentum mv.
  c. car A stops and car B has momentum 2mv.
  d. the momentum of car B is four times as great in magnitude as that of car A.
  e. each car has half of the kinetic energy.

Question 2

Two blocks with masses 2.0 kg and 3.0 kg are placed on a horizontal frictionless surface. A light spring is placed in a horizontal position between the blocks. The blocks are pushed together, compressing the spring, and then released from rest. After contact with the spring ends, the 3.0-kg mass has a speed of 2.0 m/s. How much potential energy was stored in the spring when the blocks were released?
 a. 15 J
  b. 3.0 J
  c. 6.0 J
  d. 12 J
  e. 9.0 J

[Carissamariew]

Answer to Question 1

D

Answer to Question 2

A

[kshipps]

Gracias!

[kthug]

Excellent