Question

A body starts from rest And attains a speed of 4m/s in 5seconds. Find the acceleration of the body.

Answer 1

Answer:

A= 0.8 m/s^2

Explanation:

A= v-u/t

4-0/5

= 0.8 m/s^2

Hope you understand it.

Answer 2

Answer:

A body moving with a velocity of 4m/s is brought to rest in 5seconds, its acceleration is $0.8m/s^{2}$

Explanation:

• We know the equation of motion

       $V=u+at$

where,

V- the final velocity

u- the initial velocity

a- acceleration of the body

t- time to change the velocity

S- distance moved

• The acceleration is the change in velocity divided by time

using the first equation of motion acceleration of the body is

$a=\frac{V-u}{t}$

from the question, we have

the initial velocity $u=4m/s$

the body brought to rest so

the final velocity $V= 0$

the time taken $t=5s$

therefore the acceleration $a=\frac{0-4}{5} =-4/5=-0.8m/s^{2}$

the negative sign is due to retardation