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Q.

A projectile A is thrown at an angle of 30o to the horizontal from point P. At the same time, another projectile B is thrown up with velocity  v2 upwards from the point Q vertically below the highest point as shown. For B to collide with A,v2v1  should be

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a

b

c

2

d

12

e

4

answer is C.

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Detailed Solution

.For the particle to collide, their relative motion must be along the line joining them , i.e along horizontal. This happen when vertical velocities of both are same ∴v2=v1sin30   ⇒  v2v1=12
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A projectile A is thrown at an angle of 30o to the horizontal from point P. At the same time, another projectile B is thrown up with velocity  v2 upwards from the point Q vertically below the highest point as shown. For B to collide with A,v2v1  should be