Question

Maria drops a hammer from an apartment that is 30 meters above the ground. The

height of the hammer in meters, h, after t seconds is modeled by the function

h(t) = -t - 2t + 30. Find the approximate number of seconds it will take for the

hammer to hit the ground. Round your answer to the nearest whole number.


A.0

B.5

C.10

D.30

Answer 1

C. 10 s.

Explanation:

When the hammer reaches the ground the height is 0 m, so:

-t - 2t + 30 = 0

-3t = -30

t = -30/-3

= 10 seconds.