Velocity and acceleration

Give reasons

Displacement is a vector quantity.

            Displacement is a vector quantity because it has both magnitude and direction.

Speed is a scalar quantity.

            Speed is a scalar quantity as it has only magnitude no direction.

Average speed is same as the actual speed in case of a body having uniform motion.

            A body moving with uniform motion has its speed constant. The distance covered by a uniformly moving body every second is constant. So average speed is same as the actual speed in case of a body having uniform motion.

An artificial satellite goes around the earth in a perfect circular orbit with constant speed.

            An artificial satellite going around the earth is constantly pulled by the earth. To overcome this centripetal force a centrifugal force is required. So artificial satellites are launched in a circular orbit with constant speed. Due to this they keep moving in their orbit rather than falling toward the earth.

Differences between given terms:-

1. Scalar Vs Vector Quantity

2. Distance Vs Displacement