The odometer of a car reads 2000km at the start of the trip and 2400km at the end of the trip. If the trip took 8 hr, calculate the average speed of the car in km.hr -1 and m.s-1 .
Answers
Answer:
Given :
Initial odometer reading=2000km
Final odometer reading=2400km
Total distance= Final distance- Initial distance
Total distance= Final distance- Initial distance=2400-200=400km
Total time=8h
Average speed =?
Formula to be used :
Average speed= Total Distance/Total time
Average speed= Total Distance/Total timeAverage speed in Km/hr
Average speed=400/8
=50 km/hr
Average Speed in m/s:
1km/hr=5/18 m/s
∴50km/hr=50x5/18=250/18=13.88m/s
Given:
- Initial reading of odometer = 2000 km
- Final reading of odometer = 2400 km
- Time taken for the trip = 8 hours
To find:
→ Speed in km/hr and m/s
Solution:
The difference in the odometer reading from the start to the end of the trip indicates the distance of the trip.
So, Distance travelled = 2400 km - 2000 km
⇒ Distance = 400 km
We know that:
Speed = Distance ÷ Time
⇒ Speed = 400 km ÷ 8 hr
⇒ 【Speed = 50 km/hr】
Now for finding speed in m/s;
Multiply the speed obtained in km/hr with 5/18
Speed = (50 × 5) ÷ 18
⇒ Speed = 250 ÷ 18
⇒ Speed = 13.89 m/s
∴ Speed in km hr⁻¹ = 50 km hr⁻¹
Speed in m s⁻¹ = 13.89 m s⁻¹