An object moves on a circular path of radius 21 m with uniform speed. If it takes 11 seconds to complete half revolution, then what is its speed?
(A) 6 m/s
(B) 6.6 m/s
(C) 66 m/s
(D) none of these
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Answer:
a)6m/s
Explanation:
Radius = 21m
Circumference = 2×22/7×21 = 132
distance travelled = half circumference = 66m
time = 11s
Speed = distance/time
= 66/11 = 6m/s
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