As object moving east, and it’s velocity changes from 65 m/s to 2/5ms in 10 seconds. which describes acceleration?

-4.0 m/s^2

Explanation:

Acceleration is defined as the rate of change in velocity:

where

v is the final velocity

u is the final velocity

t is the time elapsed

For the object in this problem,

u = 65 m/s

v = 25 m/s

t = 10 s

So the acceleration is

The negative sign tells that the acceleration is opposite (=west) to the velocity (which is towards east).