Author Question: A 75.0-kg halfback running north with a speed of 11.0 m/s is tackled by a 80.5-kg opponent running ... (Read 118 times)

misspop · **on:** Jul 28, 2018

A 75.0-kg halfback running north with a speed of 11.0 m/s is tackled by a 80.5-kg opponent running south at 7.5 m/s. The collision is perfectly inelastic. Compute the velocity of the two players just after the tackle.
a. 9.2 m/s south
b. 1.4 m/s south
c. 1.4 m/s north
d. 40 m/s north
e. 9.2 m/s north

Question 2

A billiard ball is moving in the x-direction at 30.0 cm/s and strikes another billiard ball moving in the y-direction at 40.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. What is the change in kinetic energy of the system as a result of the collision?
a. 0
b. some positive value
c. some negative value
d. No answer above is correct.