As the rock in this figure falls after being dropped from a great height:
a. its speed increases until it reaches a constant value, but its acceleration decreases gradually to zero.
b. its speed continues to increase while its acceleration goes to zero.
c. both the speed and the acceleration increase.
d. its speed decreases while its acceleration continues to increase.
e. its speed slows to zero while its acceleration reaches a terminal value.
Question 2
Imagine that you are pulling your little sister on a sled and that the sled is speeding up. The diagram shown here is the free-body diagram for the sled. The net force on the sled in the vertical (up/down) direction is _________, but the net force in the horizontal direction is _________.
a. zero/zero
b. zero/pointing to the right
c. zero/pointing to the left
d. pointing upward/zero
e. pointing downward/zero
Speed of Earth
figure 18-1 pituitary hormones
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