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# An object is projeced with a velocity of $20\;m/s$ making an angle of $45^{\circ}$ with horizontal. The equation for the trajectory is $"h = Ax - Bx^2"$ where $'h'$ is height, $'x'$ is horizontal distance A and B are constats. The ratio $A : B$ is : $(g = 10\;m/s^2)$

( A ) $1:5$
( B ) $1 : 40$
( C ) $40 : 1$
( D ) $5:1$