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

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

taramgrant0543664 · Answer

Acceleration is just the change in velocity divided by the change in time so you just have to take the 10m/s divided by 4s
Since west is positive and the jet ski is going west your answer will be positive.

anonymous · Answer

A?

taramgrant0543664 · Answer

Yes it would be A

anonymous · Answer

sweet if you help me with one more i'll give you a metal

anonymous · Answer

Which of the following has no acceleration? 	
	
 
A.
	a satellite orbiting at a constant speed
	
 
B.
	a person running once around a track at a constant speed
	
 
C.
	a car making a turn at a constant speed
	
 
D.
	a person running 100 m straight across a field at a constant speed

anonymous · Answer

brb

anonymous · Answer

@taramgrant0543664 ?

taramgrant0543664 · Answer

It would be D because acceleration exists for the rest because there was a change in direction but not in this case it was a straight run

astrophysics · Answer

Think of acceleration as $$\frac{ \Delta v }{ \Delta t }$$ so the change in velocity over time

astrophysics · Answer

Yes, D is right, as your speed is at constant a = 0

astrophysics · Answer

As tara mentioned, there is no change in direction and if you think of velocity, which is $$\frac{ \Delta d }{ \Delta t }$$