Author Question: A 3.0-kg object moving in the positive x direction has a one-dimensional elastic collision with a ... (Read 111 times)

asmith134 · **on:** Jul 28, 2018

A 3.0-kg object moving in the positive x direction has a one-dimensional elastic collision with a 5.0-kg object initially at rest. After the collision the 5.0-kg object has a velocity of 6.0 m/s in the positive x direction. What was the initial speed of the 3.0 kg object?
a. 6.0 m/s
b. 7.0 m/s
c. 4.5 m/s
d. 8.0 m/s
e. 5.5 m/s

Question 2

A 1.0-kg ball is attached to the end of a 2.5-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point in its swing when it is moving horizontally, the ball collides elastically with a 2.0-kg block initially at rest on a horizontal frictionless surface. What is the speed of the block just after the collision?
a. 2.3 m/s
b. 4.7 m/s
c. 3.5 m/s
d. 3.0 m/s
e. 7.0 m/s