Question

A boy goes from point A to point B in a straight line with a speed of 60 km/hr and returns to A with a speed of 40km/hr. Find
1) average speed and 2) average velocity
Please help!!

Answer 1

Answer:average velocity is 0 since displacement is 0 . average speed is 48km/hr

Explanation:

average speed =total distance / total time

let distance from a to b is x then total distance is 2x.

speed=distance / time,

 time from a to b is x/60 and b to a is x/40,

then total time x/60+x/40,

average speed=2x/(x/60+x/40)

                         =48km/h