Question

The velocity of a an object in linear motion changes from +25 meters per second to +15 meters per second in 2.0 seconds.

Answer 1

`-5.0 m/s^2`

Step-by-step explanation:

Missing question:

What is the object's acceleration?

Solution:

The acceleration of an object is given by

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

where

v is the final velocity

u is the initial velocity

t is the time taken for the change in velocity

For the object in this problem,

u = +25 m/s

v = +15 m/s

t = 2.0 s

Substituting,

`a=(15-25)/(2)=-5.0 m/s^2`

And the acceleration is negative because its direction is opposite to that of the velocity.