A 3.0-kg mass moving in the positive x direction with a speed of ...

[frankwu]

A 3.0-kg mass moving in the positive x direction with a speed of 10 m/s collides with a 6.0-kg mass initially at rest. After the collision, the speed of the 3.0-kg mass is 8.0 m/s, and its velocity vector makes an angle of 35 with the positive x axis. What is the magnitude of the velocity of the 6.0-kg mass after the collision?
 a. 2.2 m/s
  b. 2.9 m/s
  c. 4.2 m/s
  d. 3.5 m/s
  e. 4.7 m/s

Question 2

A 3.0-kg mass sliding on a frictionless surface explodes into three 1.0-kg masses. After the explosion the velocities of the three masses are: (1) 9.0 m/s, north; (2) 4.0 m/s, 30 south of west; and (3) 4.0 m/s, 30 south of east. What was the magnitude of the original velocity of the 3.0-kg mass?
 a. 1.7 m/s
  b. 1.0 m/s
  c. 1.3 m/s
  d. 2.0 m/s
  e. 2.8 m/s

[micaelaswann]

Answer to Question 1

B

Answer to Question 2

A

[frankwu]

Excellent

[xiazhe]

Gracias!