Question

A car covers 100 km in 2 h. Calculate its speed in km/h and m/s.

Answer 1

Answer:

The magnitude of the velocity  v  is calculated by dividing the distance by the time period. In other words,

v=s/t

=100/2

=50km/hr

Now, to convert 50 km/h into some speed expressed in m/s, we make use of the definition that there are 1000 m in 1 km, which means that, in order to convert 50 km into m, we have to multiply 50 with 1000

v=50 km/h×1000 m=50000 m/h.  

 Now, let’s convert one hour to seconds. We know there are 60 minutes in one hour, and 60 seconds in one minute, which means there are

60 minutes×60 seconds=3600 seconds  in one hour. So, now we can write

v=50000m/3600 seconds=50000m 3600 s = 14m/s rounded to 1 significant figure.  

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Explanation:

Answer 2

Answer:

Explanation:

Given :-

Distance covered by car = 100 km = 100000 m

Time taken by car = 2 hour = 2 × 3600 = 7200 seconds

To Find :-

Speed

Formula to be used :-

Speed = Distance/Time

Solution :-

Putting all the values, we get

In km/h

Speed = Distance/Time

⇒ Speed = 100/2

⇒ Speed = 50 km/h

Hence, the speed of car is 50 km/h in km/h.

In m/s

Speed = Distance/Time

⇒ Speed = 100000/7200

⇒ Speed = 13.88 m/s

Hence, the speed of car is 13.88 m/s in m/s.