# Complete of follo

(a) Zero

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force(acceleration).

(b) Zero, 89 km/h

let the distance from Station A to B be ‘s’ km,

Then the time taken to travel from A to B ‘t1’ = s/100 hours

The time taken to travel from B to A ‘t2’ = s/80 hours.

Total time taken t1+t2

Total Distance Travelled = 2s km

Average speed = = = 89 km/h

Displacement will be zero, because initial and final positions are same.

Average Velocity = = 0

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