Question

An object is moving east, and it’s velocity changes from 65m/s to 25m/s in 10 seconds. Which describes the acceleration?

Answer 1

Answer:

4 m/s2 in negative acceleration

Explanation:

If An object is moving east, and it’s velocity changes from 65m/s to 25m/s in 10 seconds, it is 4 m/s2 in negative acceleration.

Hope this helps!

Answer 2

Answer:

$-4\frac{m}{s^2}$

Explanation:

The object changes its speed over some time, this means that there is an acceleration.

It has a uniformly accelerated movement.

The Formula for finding speed in a uniformly accelerated motion is

$a=\frac{V_{f}-V_{o}}{t}$

$V_{o}= 65\frac{m}{s}\\V_{f}= 25\frac{m}{s} \\t= 10s$

Replace

$a=\frac{(25-65)\frac{m}{s} }{10 s}\\ a=\frac{-40\frac{m}{s} }{10s}\\a= -4\frac{m}{s^2}$

Acceleration gives us a negative value this means that it is slowing.