Question

A body moving with a velocity of 40m/s is brought to rest in 5seconds,what is it acceleration

Answer 1

Answer:

given that,

velocity :- 40m/s

time:- 5seconds

acceleration=velocity/time

=40m/s/5s

=8m/s2

the acceleration of the body is 8m/s2

Answer 2

Answer:

A body moving with a velocity of 40m/s is brought to rest in 5seconds, its acceleration is $8m/s^{2}$

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 $u=40m/s$

the body brought to rest so

the final velocity $V= 0$

the time taken $t=5s$

therefore the acceleration $a=\frac{0-40}{5} =-40/5=-8m/s^{2}$

the negative sign is due to retardation