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A projectile is thrown with initial velo...

A projectile is thrown with initial velocity `u_(0)` and angle `30^(@)` with the horizontal. If it remains in the air for 1s. What was its initial velocity ?

A

`19.6 ms^(-1)`

B

`9.8 ms^(-1)`

C

`4.9 ms^(-1)`

D

`1ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
Time of flight, `T =(2u sin theta)/(g)`
Given, `u = u_(0), T = 1s, theta = 30^(@), g = 9.8ms^(-2)`
`u_(0) = u = g = 9.8 ms^(-1)`
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