A baseball is thrown and lands 120 m away. While the ball is in flight, assuming the effect of air friction is negligible, which of the following is true?
a. At maximum height the ball has its greatest kinetic energy.
b. The horizontal component of the baseball's kinetic energy is constant.
c. The vertical component of the baseball's kinetic energy is constant.
d. The mechanical energy of the baseball is greater when nearer to the ground. e. No answer above is correct.
Question 2
The force of static friction exerted on an automobile's tires by the ground
a. provides the accelerating force that makes the car move forward. b. does positive work on the car while it is accelerating.
c. does negative work on the car while it is decelerating.
d. does everything listed in (a), (b) and (c).
e. only does positive or negative work as in (b) or (c).
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