What is the acceleration of an object if it goes from a velocity of +25 m/s to rest in 5.0 s?

A.
–5 m/s2

B.
+5 m/s2

C.
–25 m/s2

D.
+25 m/s2

Question

What is the acceleration of an object if it goes from a velocity of +25 m/s to rest in 5.0 s?	
 
 A.
–5 m/s2
 
 B.
+5 m/s2
 
 C.
–25 m/s2
 
 D.
+25 m/s2

anonymous · Answer

I need to know as soon as possible! I will give medals.

surry99 · Answer

use v = vinitial +at

anonymous · Answer

$$\color{green}{\vec{a} = \frac{\Delta \vec{v}}{\Delta t} = \frac{\vec{v}_f - \vec{v}_i}{\Delta t}}$$

anonymous · Answer

I'm still confused

anonymous · Answer

The equation ghuczek gave is just saying to take the difference in velocity and divide it by the change in time:

initial speed: 25 m/s
final speed: rest = 0 m/s
initial time: 0 s
final time: 5 s

acceleration = (final speed - initial speed) / (final time - initial time)

anonymous · Answer

Thank you guys!!!