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Chilukuri Sai Kartik Grade: 12
        

A football is kicked vertically upward from the ground and a person gazing out of window sees it moving upwards past him at 5 m/s.Window is 15m above the ground.Ignore air resistance And take g=10.

How high does the ball go above ground? and how much time does it take to go from ground to highest point?

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear Chilukuri Kartik


let the initial velocity of football is u m/sec


motion from ground to window


v=5m/sec


h=15m


v2 =u2 -2gh


25=u2 -2*10*15


u2=325


motion from window to highest point


u=5 m/sec , v=0


v2 =u2 -2gh


0=25-2*10*h


h=5/4 m


so total hight =15+5/4 =65/4 m


motion from ground to max hight


u=√325


v=0


v=u-gt


t=√325/10  sec





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7 years ago
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