Author Question: A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is ... (Read 188 times)

Charlie · **on:** Jul 28, 2018

A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just after the collision?
a. 1.7 m/s
b. 1.1 m/s
c. 1.5 m/s
d. 1.3 m/s
e. 2.1 m/s

Question 2

An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision?
a. 32 J
b. 52 J
c. 41 J
d. 25 J
e. 29 J