Its average speed will be 25 m/s approximately. The correct answer is option C
What is Average Speed ?
Average speed is the ratio of total distance travelled to the total time taken. It is a scalar quantity and the S.I unit is m/s
Given that a car travels one third of a path with speed of 50 m/s and two third of path with 20m/s.
If the car travels one third of a path with speed of 50 m/s, then the time taken will be
Speed = distance / time
Time = distance / speed
Time = 1/3 ÷ 50
Time = 6.67 x [tex]10^{-3}[/tex] s
If the car travels the remaining two third of a path with speed of 20 m/s, then, the time taken will be
Time = distance / speed
Time = 2/3 ÷ 20
Time = 0.0333
Total time = 0.03333 + 0.00667
Total time = 0.04
The total distance travelled = 1
Average speed = Total distance travelled ÷ Total time
Average speed = 1/0.04
Average speed = 24.99979 m/s
Therefore, its average speed will be 25 m/s approximately.
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