An object is dropped from a height of 25 meters. at what velocity will it hit the ground?

Asked by maham237 @ 27/12/2020 in Physics viewed by 336 People

An object is dropped from a height of 25 meters. At what velocity will it hit the ground?
A. 7.0 meters/second
B. 11 meters/second
C. 22 meters/second
D. 49 meters/second
E. 70 meters/second

Answered by maham237 @ 27/12/2020

Using kinematics, the variables we know are:

Acceleration (due to gravity) = 9.81m/s^2 [down]
distance = 25m
Vi = 0m/s

Since we don't know time we can use the equation:

Vf^2 = Vi^2 + 2ad

Vf^2 = 0^2 + (2)(-9.81)(-25)

Vf^2 = 490.5m/s

Vf = 22m/s

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