Question

a) Write 2 difference between speed and velocity. b) When is a body said to have i) uniform velocity ii) Variable velocity?c) How is average velocity calculated when its velocity changes at non-uniform rate?​

Answer 1

Step-by-step explanation:

a)1-Speed is a scalar quantity

2-Speed=Distance/Time Taken

1-Velocity is a vector quantity

2-Velocity=Displacement/Time taken

b) i-A body is said to have uniform velocity when it covers equal distances in equal intervals of time in a particular direction.

II) Variable Velocity -It has non uniform speed or it's direction of motion keeps changing or both changes with time.

c) Average Velocity =Total displacement /Total time taken

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Answer 2

a)Speed is a scalar quantity and velocity is a vector. Speed only determines the magnitude that is how fast is a body moving whereas velocity determines the direction also that is in which direction the body is moving. Speed is the rate of change of distance whereas velocity is the rate of change of displacement.

c)When the velocity of a body changes at a non-uniform rate, its average velocity is found by dividing the net displacement covered by the total time taken.

I didn't understand the b question

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