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Q.

A particle is thrown at time t = 0 with a velocity of 10 ms-1 at an angle 60o with the horizontal from a point on an inclined plane, making an angle of 30owith the
horizontal. The time when the velocity of the projectile becomes parallel to the incline is

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a

23s

b

13s

c

3s

d

123s

answer is B.

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Detailed Solution

vy=vsin⁡30∘−gcos⁡30∘t

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t=vsin⁡30∘gcos⁡30∘=vg13=13s

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