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A particle is thrown at time t = 0 with ...

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

A

`2/(sqrt3) s`

B

`1/(sqrt3) s`

C

`sqrt3 s`

D

`1/(2(sqrt3)) s`

Text Solution

Verified by Experts

The correct Answer is:
B
b. `v_y = v sin 30^@ - g cos 30^@t`

`t= (vsin30^@)/(gcos30^@) = v/g 1/(sqrt3) = 1/(sqrt3)s`.
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