# physics

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If an object is thrown in an upward direction from the top of a building 160 ft. high at an initial speed of 21.82 mi/h., what is its final speed when it hits the ground?(Disregard wind resistance. Round answer according to significant figures and do not reflect negative direction in your answer.

• physics -

Kinetic energy increase = Potential energy decrease
(M/2) [V2^2 - V1^2] = M g H
[V2^2 - V1^2] = 2 g H
Solve for V2, the final velocity.
V1 = 21.82 m/s
The V2 answer will not depend upon the direction it was thrown!

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