In the previous problem, the velocity of the shell will be

Options

A. `30ms^(-1)`
B. `30sqrt(2)ms^(-1)`
C. `30sqrt(3)ms^(-1)`
D. none of these

Answer

b

Explanation

`45=H=(u^(2) sin^(2)45^(@))/(2xx10)implies 45=(u^(2).1//2)/(2xx10)`
`u^(2)=45xx20xx2=90xx20impliesu=30sqrt2`