a man walks 1700 kilometre east in 2 hours and then 1250 kilometre west in 1 hour find the average speed and the velocity for the entire journey
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total time taken = 2+1 = 3hrs
east is taken as positive then west which is right backwards is taken as negative. so, displacement (which is vector having direction too) = 1700-1250 = 450km
velocity = displacement /time
Velocity = 450/3 = 150Km/hr.
BUT,distance (being a scalar quantity having only magnitude) = 1250+1700 = 2950km
speed = distance / time
speed = 2950km/3hr
speed = 983.33km/hr
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