10. If the net work done on a particle is zero, which of the following statements must be true? A. The velocity is decreased B. The velocity is unchanged C. The speed is unchanged D. The velocity is zero
10. If the net work done on a particle is zero, which of the following statements must be true?
A. The velocity is decreased
B. The velocity is unchanged
C. The speed is unchanged
D. The velocity is zero
11. The work required to accelerate an object on a frictionless surface from a speed v to a speed 2v is
A. equal to the work required to accel erate the object from v = 0 to v
B. twice the work required to accelerate the object from v = 0 to v
C. three times the work required to accelerate the object from v = 0 to V
D. four times the work required to ac celerate the object from 2v to 3v
E. not known without knowledge of the acceleration
12. A certain truck has twice the mass of a car. Both are moving at the same speed. If the kinetic energy of the truck is K, what is the kinetic energy of the car?
A. K/4
B. K/2
C. 0.71K
D. K
E. 2K
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