Question:the formula for the distance an object falls is d=.5gt^2 (air resistance ignored), where g is acceleration due to gravity, 9.8 m/s^2, and t is time of fall. if a rock is dropped 122.5 meters to the ground, how many seconds does the rock fall?
4 sec.
5 sec.
6 sec.
7 sec.
8.5 sec.
Answers:
the answer is 5 sec. on questions like this it may be faster to just plug in the answers. ex. 5^2=25, so 25x9.8x.5=122.5
122.5 = .5 * 9.8 * t ^2
122.5 = 4.9 *t^2
122.5/4.9 = t^2
25 = t^2
t = 5
5 seconds
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