Differences Between Speed and VelocityS.No. SPEED VELOCITY1. It is defined as the rate of change of distance. It is defined as the rate of change of displacement.2. It is a scalar quantity. It is a vector quantity.3. It can never be negative or zero. It can be negative,zero or posituve.4. Speed is velocity without direction. Velocity is directed speed.5. Speed may or may not be equal to velocity. A body may possess different velocities but the same speed.6. Speed never decreases with time. For a moving body, it is never zero. Velocity can decrease with time. For a moving body , it can be zero.7. Speed in SI is measured in ms-1 Velocity in SI, is measured in ms-1

SPEED IS A SCALAR QUANTITY.VELOCITY IS A VECTOR QUANTITY.SPEED OF AN OBJECT IS ALWAYS POSITIVE.VELOCITY OF AN OBJECT CAN BE positive OR NEGATIVE. AVERAGE SPEED OF A MOVING OBJECT CANNOT BE ZERO.AVERAGE VELOCITY OF A MOVING OBJECT CAN BE ZERO. DISTANCE TRAVELLED BY AN OBJECT PER UNIT TIME IS KNOWN AS SPEED.THE DISTANCE TRAVELLED BY AN OBJECT IN A PARTICULAR DIRECTION PER UNIT TIME IS KNOWN AS ITS VELOCITY.