a boy is runnig on a striaght road he runs 500 m towards north in 2 m 10 s and then turns back and runs 200m in1 m calculate the average speed
Speed=d/t=(500+200)/(120+10+60)=3.68m/s.
To calculate the average speed, we need to find the total distance traveled and the total time taken.
First, let's calculate the total distance covered. The boy runs 500m towards the north and then turns back and runs 200m. So, the total distance covered is 500m + 200m = 700m.
Now, let's calculate the total time taken. The boy takes 2 minutes and 10 seconds (or 2 × 60 sec + 10 sec = 130 sec) to run 500m towards the north. He then takes 1 minute (or 1 × 60 sec = 60 sec) to run 200m back. So, the total time taken is 130 sec + 60 sec = 190 sec.
Finally, we can calculate the average speed using the formula: Average Speed = Total Distance / Total Time.
Average Speed = 700m / 190 sec = 3.68 m/s (rounded to two decimal places).
Therefore, the average speed of the boy is approximately 3.68 m/s.