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Home Q & A Board Science-Related Homework Help Physics
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lendwill lendwill
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11 years ago
If a race car travels a complete lap on a circular track with radius 500 meters in 50 seconds, how do you find displacement for the velocity and how is it different from speed?
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#1
11 years ago
Velocity is speed with a direction.
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#2
11 years ago
Velocity is a vector, so has direction associated with it, while speed is simply scalar, with only magnitude

speed = 10 m/s

however velocity, since it involves displacement, is equal to zero
this is because at the end of one lap, you are in the same position as you started, so there is no net displacement
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#3
11 years ago
velocity is a vector, speed is a scalar

velocity is rate of change of position, v= d(x,y,z)/dt
So displacement is the integral of velocity over time.
The integral of the velocity of something going in a circle for one revolution is zero - the object is back where it started.

The average speed of the car around the track is the circumference of the track divided by the time, i.e. pi * 500 / 50 or about 31.4 m/s

The instantaneous velocity is unknown, but non-zero. The average velocity is zero, since that is the total displacement (zero) divided by time.
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juldina1juldina1
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11 years ago
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