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6 June, 18:27

A stone is dropped from the roof of a tall building. A person measures the speed of the stone to be 49 m/sec when it hits the ground. The height of the building is closest to:

Select one:

a. 24 meters.

b. 49 meters.

c. 122 meters.

d. 245 meters.

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Answers (1)
  1. 6 June, 18:44
    0
    V^2 = u^2 + 2gh

    since the stone is dropped, the initial speed is 0.

    v^2 = 2gh

    49^2 = 2 x 9.8 x h

    h = 2401 / 19.6 = 122.5 meters

    The height of the building is closest to 122 meters.
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