A car that travels twice as fast as another car when braking to a stop will skid
A) twice as far.
B) four times as far.
C) depends on the mass of the cars.
Answer: B
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As a basketball player starts to jump for a rebound, he begins to move upward faster and faster until he leaves the floor. During this time that he is in contact with the floor, the force of the floor on his shoes is:
a. bigger than his weight. b. equal in magnitude and opposite in direction to his weight. c. less than his weight. d. zero.
Suppose a planet with mass M has a moon with mass M. Where is the system’s center of mass? Refer to the diagram below. 
A. A B. B C. C D. D E. E
(b) Two identical particles with equal speeds, one moving east and one moving west, collide. After the collision, the same particles move north and south, respectively, with the same speeds that they had originally.
A. C B. F
Different dog breeds have been bred by humans from a common ancestor over the past few thousand years. This is an example of
A) natural selection B) un-natural selection C) artificial selection D) artificial insemination