A 1.0-kg object moving 9.0 m/s collides with a 2.0-kg object ...

[lak]

A 1.0-kg object moving 9.0 m/s collides with a 2.0-kg object moving 6.0 m/s in a direction that is perpendicular to the initial direction of motion of the 1.0-kg object. The two masses remain together after the collision, and this composite object then collides with and sticks to a 3.0-kg object. After these collisions, the final composite (6.0-kg) object remains at rest. What was the speed of the 3.0-kg object before the collisions?
 a. 15 m/s
  b. 10 m/s
  c. 5.0 m/s
  d. 20 m/s
  e. 25 m/s

Question 2

A 5.0-g particle moving 60 m/s collides with a 2.0-g particle initially at rest. After the collision each of the particles has a velocity that is directed 30 from the original direction of motion of the 5.0-g particle. What is the speed of the 2.0-g particle after the collision?
 a. 72 m/s
  b. 87 m/s
  c. 79 m/s
  d. 94 m/s
  e. 67 m/s

[xMRAZ]

Answer to Question 1

C

Answer to Question 2

B

[lak]

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[xMRAZ]

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