What determines the direction of motion of an object velocity or acceleration ?

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Velocity

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Write true or false for the following statements

The motion in animals is called locomotion. Mechanics deals with the motion of non$-$living objects.

Two stones are thrown vertically upwards simultaneously with their initial velocities $u _{1}$ and $u _{2}$ respectively. Prove that the heights reached by them would be in the ratio of $u_{1}^{2}: u_{2}^{2}$ (Assume upward acceleration is $-\,g$ and downward acceleration to be $+g$.

A body can have zero average velocity but not zero average speed. Justify giving an example.

Name a physical quantity that essentially changes as a body moves.

Two cars moving in opposite directions cover same distance $'d'$ in one hour. If the cars were moving in north$-$south direction, what will be their displacement in one hour ?