Question

Claire starts driving with an initial velocity of 5.0 m/s towards north. She drives along a straight, level path with a uniform acceleration and travels 500. M in 20. Seconds. A. What is the average velocity for the entire 20. Seconds? B. What is the velocity at the end of 20. Seconds?

Answer 1

A. 25 m/s

B. 100 m/s (i'm not sure about this one)

Step-by-step explanation:

A. To find average velocity: velocity = distance / time

So it would be V = 500 m / 20 sec = 25 m/s

*This equation can only be used if you are finding velocity for a constant speed or direction or specific distance (in this case it was specific distance).

B. final velocity = initial velocity + acceleration * time

Initial velocity (5.0 m/s) and time (20 sec) is given but not acceleration.

To find acceleration: a = (final velocity - initial velocity) / time

To find final velocity = 5.0 + a * 20

Since there's a missing variable for both equation we will plug the final velocity equation into the acceleration equation so it looks like this :

a = ((5.0 + a * 2.0) - 5.0) / 20

Now solve to get a (acceleration)

Acceleration ends up being 0. So now that we know acceleration we can solve for the final velocity.

final velocity = 5.0 + 0 * 20

= 100 m/s

I know it's a lot but I hope that makes sense! Also for B. I'm not sure if it's right at all but if later I figure out it's wrong I'll edit my answer.