Question

Q1.The odometre of a car reads 2000km at the start of a trip and 2400km at the end of the trip. If the trip took 8h, calculate the average speed of the car in km\sf{h}^{-1}h −1 and m\sf{s}^{-1}s −1
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Answer 1

Explanation:

Answer:

The average speed is 50 kmph which is 13.89 m/s in (m/s).

Explanation:

Given :

Total time taken = 8 hrs.

Odometer of a car reading (Initial reading) = 2,000 km

Odometer of a car reading (Final reading) = 2,400 km

Find :

Calculate the average speed of the car in km\

$sf{h}^{-1}h </p><p>−1</p><p> and m\sf{s}^{-1}s </p><p>−1$

Solution :

Total distance = Final distance - Intial distance

= 2,400 - 2,000 = 400

Total distance = 400 km

Total distance covered by car = 400 km

★ Average Speed :

Average Speed = Total distance covered by car / Total time taken

• Average speed in kmph =

= 400 / 8

= 50

Average speed in kmph = 50 kmph

• Average speed in m/s =

1 km = 1000 m

1 hr = 3600 s.

50 kmph =

= 50 × 1000 / 3600

= 13.89

Average speed in m/s = 13.89 m/s

Therefore, the average speed is 50 kmph which is 13.89 m/s in (m/s).