The sign of acceleration is taken as positive in the equations of motion if the directions of velocity and acceleration are .
If the upward direction is taken as positive what is the sign of velocity and acceleration when a body falls freely from a height.
A sign convention is used, the positive direction for position, velocity and acceleration is upward. A ball of mass m is thrown upward with velocity V and caught during returning. Identify the signs of position, velocity and acceleration during ascending part of the trajectory.