Question

The formula for the height of a falling object is shown below, where h is the height of the object in meters, t is the time in seconds, and k is the height, in meters, from which the object began its fall.

h = –4.9t² + k

If a rock is dropped from a building that is 150 meters tall, what is the height of the rock 4 seconds after it was dropped?


F
71.6 meters
G
78.4 meters

H
130.4 meters
J
145.1 meters

Answer 1

71.6

Answer 2

Josh hit a baseball straight up into the air. The equation below describes the height of the ball (h), in meters, as a function of time (t) in seconds.

h(t) = -9.8t² + 30t + 1.5

What is the height of the ball after 3 seconds?


F
3.3 meters
G
62.1 meters

H
120.9 meters
J
179.7 meters

Answer 3

3.3

Answer 4

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