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A particle is projectedfrom the origin i...

A particle is projectedfrom the origin in X-Yplane. Acceleration of particle in Y direction is a. If equation of path of the particle isy = `ax- bx^2`, then find initial velocity of the particle.

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`y=ax-bx^(2)" "y=xtantheta-(alphax^(2))/(2u^(2)cos^(2)theta)`
`tantheta=a and (alpha)/(2u^(2)cos^(2)theta)=b" "usqrt((alpha(1+a^(2)))/(2b))`.
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