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Question

A car travels 36 km in 2 hours. Its average speed in m s1 is
  1. 5


Solution

The correct option is A 5
Average speed = Distance travelled / Time taken
=362 kmph

=18 kmph

The speed is in kmph. In order to convert it to m s1, we need to convert the units of distance and time

18 kmph=18 km1 hr

=18×1000 m1×60×60 s

=18×10003600 m s1

=5 m s1
 

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