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