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Question

What is the average speed and average velocity at t = 30s respectively?


A

1 m/s, - 0.33 m/s

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B

1m/s, -1m/s

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C

2m/s, -0.25 m/s

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D

2 m/s, 0

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Solution

The correct option is A

1 m/s, - 0.33 m/s


For speed

Average speed = total distancetotal time

Particle travels 10 m from 0 to tB then stays at rest from tB to tC, then another 10 m from tC to t = 20s.

Then another 10 m in the opposite direction from t = 20s to 30s.

Averagespeed=10+0+10+1030=3020

= 1 m/s

For average velocity,

Total average velocity,

Total displacement at t = 30, = -10m

Average speed = total distancetotal time

= 1030=13=0.33m/s.


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