Question

write 5 differences between speed and velocity. ..........?

Answer 1

 1. Speed is defined as the rate of change of distance. velocity is defined as the rate of change of displacement
. 2. speed is a scalar quantity. velocity is a vector quantity.
 3. speed can never be negative or zero. velocity 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

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Answer 2

Speed:-

i) Distance travelled per unit time is called speed.

ii) It is a scalar quantity.

iii) Only magnitude is required to represent speed.

iv) It is always positive.

v) Speed = Distance / Time.

Velocity:-

i) Distance travelled per unit time in a definite direction is called velocity.

ii) It is a vector quantity.

iii) Both magnitude and direction are required to represent velocity.

iv) It can be positive or negative.

v) Velocity = Displacement / Time.