Summary

Consider a body moving in the x-y plane with a constant acceleration **a**. It is located at point P at time t = 0, which has a position coordinate **r**_{0} and velocity **v**_{0}. It reaches point Pâ€™ at time t, has a position coordinate **r **and velocity **v**. Constant acceleration **a** is equal to change in velocity by time. Average velocity = displacement/time.

These equations imply that a body can have two independent simultaneous motions in x and y directions with constant acceleration. Similar equations can be written for three-dimensional motion also.

**Relative velocity**: Consider two bodies A and B moving in the x-y plane with velocities **V**_{A} and **V**_{B}, respectively, with respect to the co-ordinate system. The velocity of A with respect to B is written as **V**_{AB} .

When subtracting two vectors, to obtain the relative velocity vector, reverse the second vector and add the two vectors.

These equations imply that a body can have two independent simultaneous motions in x and y directions with constant acceleration. Similar equations can be written for three-dimensional motion also.

When subtracting two vectors, to obtain the relative velocity vector, reverse the second vector and add the two vectors.

Consider a body moving in the x-y plane with a constant acceleration **a**. It is located at point P at time t = 0, which has a position coordinate **r**_{0} and velocity **v**_{0}. It reaches point Pâ€™ at time t, has a position coordinate **r **and velocity **v**. Constant acceleration **a** is equal to change in velocity by time. Average velocity = displacement/time.

These equations imply that a body can have two independent simultaneous motions in x and y directions with constant acceleration. Similar equations can be written for three-dimensional motion also.

**Relative velocity**: Consider two bodies A and B moving in the x-y plane with velocities **V**_{A} and **V**_{B}, respectively, with respect to the co-ordinate system. The velocity of A with respect to B is written as **V**_{AB} .

When subtracting two vectors, to obtain the relative velocity vector, reverse the second vector and add the two vectors.

These equations imply that a body can have two independent simultaneous motions in x and y directions with constant acceleration. Similar equations can be written for three-dimensional motion also.

When subtracting two vectors, to obtain the relative velocity vector, reverse the second vector and add the two vectors.