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Question

A player kicks a foot ball at a speed of 20ms1 so that its horizontal range is maximum. Another player 24 m away in the direction of kick starts running in the same direction at the same instant of hit, if he has to catch the ball just before it reaches to ground, he should run with a velocity equal to (g=10ms2)

A
4ms1
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B
5.65ms1
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C
10ms1
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D
12ms1
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Solution

The correct option is B 5.65ms1
Maximum range of ball R=u2sin2θg
Now, R=20×20×110=40m
Distance travelled by second man= 4024=16m
Time= t=40ucos45o=22S
Speed v=distancetime=1622=5.65m/s

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