# Two dimensional acceleration question

#### F.B

My book stinks it doesnt explain or show you how to do enough examples. But anyways i have another problem now. I figured out how to do my other question. Anyways my question is.......

A car with a velocity of 25 m/s [E] changes its velocity to 25 m/s in 15s. Calculate the car's average acceleration.

How do i start this question off. I dont know what to do.

Related Introductory Physics Homework News on Phys.org

#### 2Pac

Are we looking for a magnitude of acceleration or a vector form?

#### F.B

the magnitude and degrees/direction

#### Doc Al

Mentor
Use the definition of average (vector) acceleration:
$$\vec{a}_{ave} = \frac{\Delta \vec{v}}{\Delta t}$$

(Hint: To find the change in the velocity, write the initial and final velocity in component form and then subtract.)

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving