I don't know how to solve it properly I am not getting ans

Question

Eshan · Answer

Dear student,

Since the velocity of falling ball with respect to boy is vertical, their speed in the horizontal direction must be same. Since the speed of ball along horizontal direction at all times remains $ucos60^{\circ}$ ,

$ucos60^{\circ}=20$
$\implies u=40km/hr$

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I don't know how to solve it properly I am not getting ans

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I don't know how to solve it properly I am not getting ans

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I don't know how to solve it properly
I am not getting ans