a car travels a certain distance with a speed of 50 km/h and returns with a speed of 40 km/h. Calculate average velocity of car for the whole journey
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let distance between the starting and ending position be x.
therefore, total d = x + x = 2x
total time = total distance / total speed = x/50+x/40 hr= 4x+5x/200=9x/200
Therefore, avg velocity of car = distance / time
= 2x*200/9x=400/9=44.44m/s
therefore, total d = x + x = 2x
total time = total distance / total speed = x/50+x/40 hr= 4x+5x/200=9x/200
Therefore, avg velocity of car = distance / time
= 2x*200/9x=400/9=44.44m/s
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