Question

Mohan's office is 15 km away from his house.He takes 15 minutes to reach office and come back home in 20 minutes.Find (i) Avg. Speed
(ii) Avg. Velocity​

Answer 1

Average speed = 51.72 Km/hr

Average velocity = 0

Explanation:

Mohan travels from A to B in 15 minutes and from B to A in 20 minutes.

Distance between A and B is 15 Km.

Average speed:

Let us express speed in Km/hr.

Time taken 1 = 15 min = 0.25 hr

Time taken 2 = 20 min = 0.33 hr

Average speed = Total distance / total time

  = 30 / (0.25 + 0.33)

  = 51.72 Km/hr

Average velocity:

Velocity = displacement / time

Since Mohan travels to office and returns back to the point where he started, his displacement is zero.

So velocity is zero.