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If a particle travels a linear distance ...

If a particle travels a linear distance at speed `v_(1)` and comes back along the same track at speed `v_(2)`.

A

(1) Its average speed is arithmetic mean ` (v_(1) + v_(2))/(2) `

B

(2) Its average speed is harmonic mean `2 v_(1)v_(2)/(v_(1) + v_(2))/(2) `

C

(3) Its average speed is geometric mean` sqrt(V_(1)v_(2))`

D

(4) Its average velocity is zero

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