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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?`
7 years ago

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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