Question

The velocity of an object changes from 50 m/s to 20 m/s in 10 s. Find its retardation​

Answer 1

Answer:

The answer is 3m/s² retardation or -3m/s² acceleration

Explanation:

One of the equations of motion is:

v=u+at

where

v= final velocity

u=initial velocity

a=acceleration

t=time

so a=v-u/t

=20-50/10

= -30/10

= -3m/s² acceleration or 3m/s² retardation

Hope this helps!

Answer 2

Answer:

-3 m/ s²

Explanation:

intial velocity (u) = 50m/s

and, final velocity (v) = 20m/s

since,

v = u + at

20= 50 + a*10

-50+20/10=a

therefore,

a= -30/10

a= -3m/s²

therefore, retardation is -3m/s²