A motorcyclist drives from A to B with a uniform speed of 30 km /h and returns back with a speed of 20 km/h. Find its average speed?
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A motorcyclist drives from A to B with a uniform speed of 30 km /h and returns back with a speed of 20 km/h. Find its average speed?
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Speed from A to B = 30 km/h
Let the distance be x
Time = Distance / time
= x/30
Speed from B to A = 20 km/ h
Let the distance be x
time = distance/time
= x/20
Total time taken = x/30 + x/ 20
= 5x/ 60
Total distance = x + x = 2x
Average speed = total distance/ total time
= 2x ÷ 5x/60
= 2x× 60/5x
=24km /h
Answer:
Average speed is defined as the total distance travelled by the time taken whereas average velocity is defined as the displacement by the time taken. Since speed is a scalar quantity, the average speed is also considered as a scalar quantity while velocity is a vector quantity.