# physics

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A brick is released with no initial speed from the roof of a building and strikes the ground in 1.50 {s}, encountering no appreciable air drag.

A. How tall, in meters, is the building?

B.How fast is the brick moving just before it reaches the ground?

• physics -

a. h = 0.5gt^2
h = 0.5 * 9.8 * (1.5)^2 = 11m.

b. V = gt = 9.8 * 1.5 = 14.7m/s.

• physics -

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