Question

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

Answer 1

A

Step-by-step explanation:

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Answer 2

-4.0 m/s^2

Step-by-step explanation:

Acceleration is defined as the rate of change in velocity:

`a=(v-u)/(t)`

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

`a=(25 m/s-65 m/s)/(10 s)=-4.0 m/s^2`

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