First slide

Release from certain height

Question

A body let fall from the top of a building reaches the ground in 3 s. The height of the building is:

Moderate

A

14.7 m
B

29.4 m
C

44.1 m
D

66.2 m

Solution

$h = \frac{1}{2} {gt}^{2} = \frac{1}{2} \times 9.8 \times 3^{2} = 44.1 m$

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