98 Chapter 2: Differentiation
____ 24. Suppose the position function for a free-falling object on a certain planet is given by
. A silver coin is dropped from the top of a building that is 1370 feet tall. Find
velocity of the coin at impact. Round your answer to the three decimal places.
a. –286.705 ft/sec
b. –138.492 ft/sec
c. –111.041 ft/sec
d. –276.984 ft/sec
e. –261.984 ft/sec
____ 25. A ball is thrown straight down from the top of a 300-ft building with an initial
velocity of –12 ft per second. The position function is . What is the velocity of
the ball after 4 seconds?
a. The velocity after 4 seconds is –76 ft per second.
b. The velocity after 4 seconds is –116 ft per second.
c. The velocity after 4 seconds is –140 ft per second.
d. The velocity after 4 seconds is –52 ft per second.
e. The velocity after 4 seconds is –280 ft per second.
____ 26. A projectile is shot upwards from the surface of the earth with an initial velocity of
108 meters per second. The position function is .
What is its velocity after 7 seconds?
a. The velocity after 7 seconds is 181.7 meters per second.
b. The velocity after 7 seconds is –142.3 meters per second.
c. The velocity after 7 seconds is 39.4 meters per second.
d. The velocity after 7 seconds is 73.7 meters per second.
e. The velocity after 7 seconds is –176.6 meters per second.
____ 27. The volume of a cube with sides of length s is given by . Find the rate of
change of volume with respect to when centimeters.
a. 648 cm2
b. 216 cm2
c. 36 cm2
d. 108 cm2
e. 72 cm2