Answer both 3 and 4
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3. Distance = 2πr/2
= πr
Displacement = 2r
because a circle has two radius( diameter) and the body displaces half over the circle...
4. let house be A and market be B.
Distance = 7.2 km
= 7200 m
time taken = 10 min
= 10 × 60 sec
= 60 sec.
Speed in m/s = d/t
= (7200/60) m/s
= 120 m/s
therefore, speed in km / h = {120 × (18/5)} km/h
I hope it will help you...
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