Author Question: 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 ... (Read 139 times)

frankwu · **on:** Jul 28, 2018

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