# physics

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a bus travels from one point to another wuth a speed of 40km/h and returns with a speed of 60km/h.what is e average speed and average velocity of the bus?

• physics -

since the total displacement vector is zero the average speed is zero.

let i be unit vector from point A to point B
velocity outbound = 40 i
velocity back = -60 i
(40 - 60)/2 = -10

• physics -

The average velocity is zero, but the speed is not.

The total distance covered is 2d. The total time taken is

d/40 + d/60 = 5d/120
So, the average speed is 2d/(5d/120) = 48 km/hr

• physics whoops -

Whoops, sorry, Steve is right.

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