Question

convert into following km/h. a) 20 m/s b)45m/s c)30 m/s​

Answer 1

b) 1 km = 1000m

1000m = 1 km

1m = 1

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1000

45m = 45/1000

1hr = 60 * 60 seconds = 3600 seconds.

3600 sec = 1 hr

1 s = 1/3600 hr

thus speed = distance/time:

45*3600/1000*1 = 162 km/hr