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15-04-2017
Mathematics

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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

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taskmasters taskmasters

28-04-2017

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.

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