A body covers 20 m in first second, 30 m in second and 55 m in third second. Express the average speed of the body in km/h? *
a) 35 km/h
b)140 km/h
c) 126 km/h
d) 135 km/h
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Explanation:
average speed = (20+30+55)/3
=105/3=35m/s
into km/h:
35 * 3600/1000
35*18/5
18*7
136km/h
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