Question

UKO
Express each of the following speed in km/hr:
(a) 18 m/sec
(b) 5 m/sec
(d) 80 m/sec
(e) 14 m/sec
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Answer 1

Answer:

1. The speed of a train is 45 km per hour. Calculate its speed in metres per second.

1 km = 1000 m

1 hour = 60 minutes; 1 minute = 60 seconds

1 hour = 60 × 60 seconds

Speed of the train = 45km1hour

= 45×1000m60×60sec

= 252 m/sec

= 1212 m/sec.