Question

Sabrina threw a coin from a building 160 feet high at an initial speed of 30 feet per second. how many seconds will it take the coin to hit the ground?

a. 4.2b. 4.8c. 11.1d. 13.9

Answer 1

Using the formula of free falling bodies v^2=vi^2+2as

where:
v is 0,
vi (initial) is 30ft/s as stated in the problem,
a is the gravity which is 32.2 ft/s
s is the height which is 160

substitute the values and we will get 13.97 seconds.