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16 January, 21:31

An object falls from a height of 400 feet. Its height, h, in feet is given by the equation h=-16t^2+400, where t is the time in seconds the object has fallen. How many seconds will it take for the object to reach the ground?

A.

1/5

B.

5

C.

20

D.

25

+1
Answers (1)
  1. 16 January, 21:45
    0
    16t^2=400

    t^2=25

    t=5

    5 seconds=B
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