Velocity Question for a Car Accelerating Down a Road

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Homework Statement:

A car uniformly accelerates along a straight road, goes the distance between two points 240 m apart in 8 s. Its velocity as it passes the first point is 12 m/s. Find the acceleration of the car and its velocity as it passes the second point.

Relevant Equations:

V=D/S
240/8=30.
 

Answers and Replies

  • #2
jbriggs444
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Problem Statement: A car uniformly accelerates along a straight road, goes the distance between two points 240 m apart in 8 s. Its velocity as it passes the first point is 12 m/s. Find the acceleration of the car and its velocity as it passes the second point.
Relevant Equations: V=D/S

240/8=30.
You seem to have calculated the car's average velocity. Is its velocity as it passes the first point above or below that average?
 
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You seem to have calculated the car's average velocity. Is its velocity as it passes the first point above or below that average?
I'm sorry I don't understand, its velocity as it passes the first point is 12m/s. I'm not sure how to find out its velocity as it passes the secont point.
 
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jbriggs444
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I'm sorry I don't understand, its velocity as it passes the first point is 12m/s. I'm not sure how to find out its velocity as it passes the secont point.
I repeat:

You seem to have calculated the car's average velocity. Is its velocity as it passes the first point above or below that average?
 
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I repeat:

You seem to have calculated the car's average velocity. Is its velocity as it passes the first point above or below that average?
Below?
 
  • #6
jbriggs444
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Below?
Yes. 12 m/s is less than 30 m/s.

We are told that the acceleration is uniform. Given this, will the velocity at the second endpoint be greater or less than 30 m/s?
 

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