Question

an object is moving east and its velocity changes from 65 m/s to 25 m/s in 10 seconds

Answer 1

Answer:

$-4 m/s^2$ west

Explanation:

The acceleration of an object is equal to the rate of change of velocity of the object, and it is given by:

$a=\frac{v-u}{t}$

where

u is the initial velocity

v is the final velocity

t is the time elapsed

For the object in this problem:

u = 65 m/s east is the initial velocity

v = 25 m/s east is the final velocity

t = 10 s is the time elapsed

Substituting, we find the acceleration:

$a=\frac{25-65}{10}=-4 m/s^2$

And the negative sign tells that the direction of the acceleration is opposite to the direction of the velocity: so, the acceleration is west.