Question: which if the following is the main difference between speed and velocity?
Answer: Velocity is vector quantity but speed is scaler quantity. THE BASIC DIFFERENCE BETWEEN SPEED AND VELOCITY IS: ... SPEED HAS ONLY MAGNITUDE AND NO DIRECTION WHEREAS VELOCITY HAS BOTH MAGNITUDE AND DIRECTION. 2. SPEED IS ALWAYS POSITIVE(THAT IS NON - NEGATIVE AND NON-ZERO) WHEREAS VELOCITY IS EXACTLY THE OPPOSITE.