A ball was thrown by a boy a at angle `60^(@)` with horizontal at height 1 m from ground. Boy B is running in the plane of motio

A ball was thrown by a boy a at angle `60^(@)` with horizontal at height 1 m from ground. Boy B is running in the plane of motion of ball and catches the ball at height 1 m from ground. He finds the ball falling vertically. If the boy is running at a speed 20 km/hr. Then the velocity of projection of ball is-
A. 20 km/hr
B. 30 km/hr
C. 40 km/hr
D. 50 km/hr

A ball was thrown by a boy a at angle `60^(@)` with horizontal at height 1 m from ground. Boy B is running in the plane of motion of ball and catches

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