How long would it take for a ball dropped from the top of a 81 81 -foot building to hit the ground? Round your answer to two decimal places.

Answer 1

Set the height equal to (1/2)gt^2 and solve for t.

h = (1/2)gt^2

t = (2h/g)^1/2

Plug in the numbers and get your answer in seconds:

h = 81 ft

g = 32 ft/s^2