1. An object moves along a square boundary of side 30 m such that it completes 1 round in 20 second. Find distance, displacement, speed & velocity after time 1min 30sec.
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Explanation:
In time 20 secs the object moves 30 m
in time 1 secs the object moves 30/20 m
in time 90 secs(1 min 30 secs) the object moves 30/20 *90m
=30*4.5m
= 135m------ and of distance
therefore speed is distance/time= 135/90 m/s = 1.5 m/s
total perimeter = 30* 4m
=120m
the object covered 135m
displacement is the shortest distance covered
therefore the displacement is 135-120 m = 15 m
velocity = displacement /time = 15/90 m/s =0.16m/s
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