Speedometers are used to measure speed in moving vehicles. Odometers are used to calculate the distance travelled. A graph can be used to calculate the speed as well. The distance-time graph aids in comprehending an object's speed.
Step 1: It is given that
Speed of the car for first 30km = 40 km/h
Speed of the car for the next 30km = 20 km/h
Step 2: Let us calculate the average speed of the car:
Average speed = Total distance travelled/ Total time taken
Time taken to travel the first 30 Km = 30km/ 40 km/hr = 0.75 hr
Time taken to travel the next 30 Km = 30km/ 20 km/hr = 1.5 hr
Total distance travelled = 30 km + 30 km = 60 km
Total time taken = 0.75 hr + 1.5 hr = 2.25 hr
Average speed = 60km/ 2.25 hr = 26.66 km/h
A car travels 30km at a uniform speed of 40km/h and the next 30 km at a uniform speed of 20km/h. find its average speed.
An automobile travels the first 30 km at a constant 20 km/h and the next 30 km at a constant 40 km/h. It travels at a mean speed of 26.66 km/h.