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[" 1.A player stops a football weighing ...

[" 1.A player stops a football weighing "0.5kg" which comes flying "],[" towards him with a velocity of "10nl/s" .If the impact lasts for "],[1/50" th sec.and the ball bounces back with a velocity of "15],[m/s," then the average force involved is "],[[" (a) "250N," (b) "1250N," (c) "500N," (d) "625N]]

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