An object whose mass is 100 lb falls freely under the influence of gravity from an initial elevation of 600 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. assumeg= 31.5 ft/s2

Initial speed of drop is given by

total displacement of the object from top

acceleration due to gravity

so the final speed is given by kinematics equation

so if will hit the surface at speed 200.7 ft/s

whitney would be experiencing fear or unintentional terror

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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