What can be the angle between velocity and acceleration for the motion in two or three dimension ?
In between $0^{\circ}$ to $180^{\circ}$
A particle moves in a plane along an elliptic path given by $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$. At point $(0, b)$, the $x$-component of velocity is $u$. The $y$-component of acceleration at this point is
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