1.

A cricket ball is thrown at a speed of 30 m `s^(-1)` in a direction `30^(@)` above the horizontal. The time taken by the ball to return to the same level isA. 2 sB. 3 sC. 4 sD. 5 s

Answer» Correct Answer - B
Here, `u=30ms^(-1),theta=30^(@),g=10ms^(-2)`
The time taken by the ball to return to the same level is
`T=(2usintheta)/(g)=(2xx30ms^(-1)xxsin30^(@))/(10ms^(-2))=3s`


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