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2.11 An object whose mass is 100 lb falls freely under the influence of gravity from an initial elevation of 60o ft above the surface of Earth. The initial velocity

is downward with a magnitude of50 ft/s. The effect of air resistance is negligible. Determine the velocity, in ft/s, of the object just before it strikes Earth. Assume g = 31.5 ft/s°.

Fig: 1