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A football is kicked with speed 20 ms^(...

A football is kicked with speed ` 20 ms^(-1)` at a projection angle of ` 45^@` from the ground. A receiver on the goal line `20 m` away in the direction of the kick runs the same instant to meet the ball. What must be his speed, if he has to catch the ball before it hits the ground ? Take ` g= 10 ms^(-2)`.

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The correct Answer is:
`(5.483 ms^(-1))`
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