Question

Example 8.2 The odometer of a car reads
2000 km at the start of a trip and
2400 km at the end of the trip. If the
trip took 8 h, calculate the average
speed of the car in km hl and m s.​

Answer 1

Answer:

Given :

Initial odometer reading=2000km

Final odometer reading=2400km

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 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

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Explanation:

Answer 2

Answer:

distance traveled =2400-2000

=400km

time =8hrs

avg in kmph = 400/8

= 50kmph

avg in mps = 400*1000/8*60*60

= 13.8 mps