RUNNING OUT OF TIME AND REALLY CONFUSED, DONT KNOW HOW TO DO THIS! HELP ME!

What is the average acceleration of a jet ski that goes from rest to 10 m/s west in 4 s? Take the direction west to be positive, and east to be negative.

A.
2.5 m/s2

B.
-2.5 m/s2

C.
0.4 m/s2

D.
-0.4 m/s2

Question

RUNNING OUT OF TIME AND REALLY CONFUSED, DONT KNOW HOW TO DO THIS! HELP ME!

What is the average acceleration of a jet ski that goes from rest to 10 m/s west in 4 s? Take the direction west to be positive, and east to be negative.	
 
 A.
2.5 m/s2
 
 B.
-2.5 m/s2
 
 C.
0.4 m/s2
 
 D.
-0.4 m/s2

mrnood · Answer

what is the change in velocity as given to you in the question?

anonymous · Answer

Thats all it gives me:  "jet ski that goes from rest to 10 m/s west in 4 s"

mrnood · Answer

so it starts at rest (0 m/s) and finishes at +10 m/s

so what is the change?

mrnood · Answer

no

the acceleration is change of velocity DIVIDED by time

you are nearly there.. try again

anonymous · Answer

divided lol thats what i meant

anonymous · Answer

So A

mrnood · Answer

so you were not totally confused!  :-)

anonymous · Answer

XD

anonymous · Answer

WAS, but not anymore