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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?
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
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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