A ball thrown upward has an average velocity of 14.7 m/s. Its final velocity is

Question

A ball thrown upward has an average velocity of 14.7 m/s. Its final velocity is zero. What is its initial velocity? How much time does it take the ball to get to its highest point? How high does the ball rise? A ball is thrown horizontally from a building 20 m high. How long does it take the ball to hit the ground? If the ball hits the ground a horizontal distance 20 m away from the building, what is its initial velocity? Clearly indicate magnitude and direction as an angle with respect to the horizontal. With what velocity does the ball hit the ground? Clearly indicate magnitude and direction as an angle with respect to the horizontal.

Explanation / Answer

Average velocity is Vavg = (V+V0)/2

14.7 = (0+Vo)/2

Vo = 14.7*2 = 29.4 m/sec

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time of ascent is t= Vo/g = (29.4/9.8) = 3 sec

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maximum height reahed is Hmax = Vo^2/(2*g) = (29.4^2)/(2*9.8) = 44.11 m

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