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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)/(sqrt(3))sec`

B

`(1)/(sqrt(3))sec`

C

`sqrt(3)sec`

D

`(1)/(2sqrt(3))sec`

Text Solution

Verified by Experts

`v_(y)=vsin30^(@)-g cos30^(@)t`
`t=(vsin30^(@))/(g cos30^(@))=(v)/(g)(1)/(sqrt(3))=(1)/(sqrt(3))sec`
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