A particle moves for three equal time intervals with velocities +v, +2v and -3v respectively. For the complete motion:
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Question

A particle moves for three equal time intervals with velocities +v, +2v and −3v respectively. For the complete motion:

G1 Physics · Accepted Answer

Let each time interval be τ. Total displacement = vτ + 2vτ − 3vτ = 0. So average velocity = 0. Total distance = vτ + 2vτ + 3vτ = 6vτ. Total time = 3τ. Average speed = 6vτ/(3τ)=2v.