4.A man is moving in a semicircular path of radius 14m.If he takes 4sec to
complete the path then find out his speed.
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Answer is 3.5m per second
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Given : A man is moving in a semicircular path of radius 14m
he takes 4 sec to complete the path
To Find : Speed
Solution:
semicircular path = (1/2) Circumference of circle + Diameter of circle
Circumference of circle = 2πr
Diameter = 2r
r = radius = 14 m
π = 22/7
semicircular path = (1/2) * 2 (22/7) 14 + 2(14)
= 44 + 28
= 72 m
Distance = 72 m
Time = 4 sec
Speed = 72/4 = 18 m/s
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