The final velocity v of an object in feet per second (ft/ sec) after it slides down

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The final velocity v of an object in feet per second (ft/ sec) after it slides down a frictionless inclined plane of height h feet isimage

where v0 is the initial velocity (in ft/sec) of the object.
(a) What is the final velocity v of an object that slides down a frictionless inclined plane of height 4 feet? Assume that the initial velocity is 0.
(b) What is the final velocity v of an object that slides down a frictionless inclined plane of height 16 feet? Assume that the initial velocity is 0.
(c) What is the final velocity v of an object that slides down a frictionless inclined plane of height 2 feet with an initial velocity of 4 ft/sec?image

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