A cart is sliding on a smooth incline. An observer $\left(O_1\right)$  is fixed to cart and another observer fixed on ground  $\left(O_2\right)$  observe, a loose bolt that is released from ceiling. At the instant of release cart has velocity $v_0$ as seen by $\left(O_2\right)$ . Mark the correct option.

For observer on cart
initially ${\overline{V}}_{rel}=0$ and the component of acceleration of the bolt along the incline will be same, so the relative acceleration will only be in the direction perpendicular to the plane. So the trajectory is straight line along  ${\overrightarrow{a}}_{rel}$.

For observer on ground trajectory is parabola because ${\overrightarrow{v}}_0$  and  $\overrightarrow{g}$ are at angle $\theta$ initially.