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A point moves in the x-y plane accordin...

A point moves in the x-y plane according to the equations x=at, y=at-`bt^2`.Find (a)the equation of the trajectory, (b)acceleration as a function of t, (c )the instant `t_0` at which the velocity and acceleration are at `pi//4` .

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The correct Answer is:
`y=x-b/ax^2,2b,a/b`
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