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A ball is thrown upwards from the top of...

A ball is thrown upwards from the top of an incline with angle of projection `theta` with the vertical as shown. Take `theta = 60^(@)` and `g=10 m//s^(2)` . The ball lands exactly at the foot of the incline.

The time of flight of the ball is:

A

`t=sqrt(3) s`

B

t = 4 s

C

t = 3 s

D

t = 6 s

Text Solution

Verified by Experts

The correct Answer is:
C
`u_(y)=10 cos 60^(@) =5m//s rArr 5t-1/2 gt^(2)=-30 rArr t^(2)-t-6=0 rArr t=3s `
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