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The fig. shows the displacement-time graph of a particle moving on a straight line path. What is the average velocity of the particle over 10 seconds?

(1) 2 m/s (2) 4 m/s (3) 6 m/s (4) 8 m/s

$AverageVelocity\overrightarrow{v}=\frac{Displacement}{totaltime}$

We need to find out the average velocity for whole time interval that is 10 s.

Particle starts from 60 m in 0 seconds and reach to 40 m in 10 seconds after covering distance 50 and 30 m in 6 seconds and 4 seconds respectively.

So net displacement is 60 -40 = 20 m

Time = 10 s

Average velocity = 20/10 = 2 m /s.

Regards

Total time = 10 s

Hence average displacement = - 20/10 = - 2 m/s

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