Question

The average velocity of the body is 18 m/s and final velocity is 20 m/s then the initial velocity of the body is

Answer 1

Formula :

Average velocity = ( Initial velocity + final velocity ) / 2

Given :

average velocity = 18 m/s

final velocity = 20 m/s

Calculate the initial velocity

18 m/s = ( initial velocity + 20 m/s ) / 2

= > 2 × 18 m/s = initial velocity + 10 m/s

= > initial velocity = 36 m/s - 20 m/s

= > initial velocity = 16 m/s

ANSWER :

16 m/s is the initial velocity .

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Answer 2

Solution:

It is given that, average velocity of a body is 18 m/s and final velocity is 20 m/s.

We've to calculate its initial velocity.

We know that,

$\boxed{\sf{\red{Average\:velocity\:=\:\dfrac{final\:velocity\:+\:initial\:velocity}{2}}}}$

Putting the values,

$\implies$ 18 = $\dfrac{20+initial\:velocity}{2}$

$\implies$ 18 × 2 = 20 + initial Velocity

$\implies$ 36 = 20 + initial Velocity

$\implies$ 36 - 20 = initial Velocity

$\implies$ $\sf{\blue{initial\:velocity\:=\:16\:ms^{-1}}}$

Hence, initial velocity of the body is 16 m/s.

$\rule{200}2$

Velocity : It is the displacement covered in per unit time.

Mathematically,

Velocity = Displacement/time

S.I unit of velocity is meter per second.

It is a vector quantity.