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Q.

A player kicks ball at an angle of  450 to the horizontal with initial speed of 20m/sec.  A second player, 60m away in the direction of the kick, starts immediately to catch the ball. The speed with which the second player should run so that catch the ball just before it touches the ground is (g=10m/sec2) 

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a

52m/sec

b

5 m/sec          

c

106 m/sec

d

10 m/sec          

answer is C.

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Detailed Solution

60-Range =  μ(time  of  flight )

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