Question

A body is said to have a —- when it’s final velocity is less than its initial velocity. Define the term I’m Part A

Answer 1

Answer:

That is only true if there is constant acceleration.

Average velocity is defined as total displacement divided by the total time.

If u is the initial velocity, v the final velocity, a the acceleration, s the displacement and t the time,

v = u + at

=> at = v - u → equation 1

s = ut + (1/2)at^2

average velocity = s/t

= ut/t + (1/2)at^2/t

= u + (1/2)at

= u + (1/2)(v - u) (from equation 1)

= u +(1/2)v - (1/2)u

= (u + v) / 2

Which is what you asked. So it is just the simplification derived from the definition of average velocity.

Answer 2

Answer:

body is said to have a negative when it’s final velocity is less than its initial velocity. Define the term I’m Part A