Question

An object moving with a uniform velocity of 10m per second comes to rest after 5sec.what is the acceleration

Answer 1

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Initial velocity (u) = 10m/s

Final velocity (v) = 0

Because at last the object comes at rest.

Time taken = 5sec.

Acceleration = v - u / t

= 0 - 10 / 5

= -10/5

= -2m/s^2

Here , negative sign indicates that this is Retardation.

Answer 2

initial velocity=10m per second
final velocity =0 it comes to rest
time =5sec
by using 1st
v = u +at
0=10+a*5
-10=a*5
a=-10/5
a=-2
negative sign indicate that it is retardation