A body is moving with constant speed in a circle of radius 10 m. The body completes one revolution in 4 s. At the end of 3rd second, the displacement of body from its starting point is:
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A body is moving with constant speed in a circle of radius 10 m. The body completes one revolution in 4 s. At the end of 3rd second, the displacement of body from its starting point is:

G1 Physics · Accepted Answer

In 3 s the body completes 3/4 revolution, corresponding to 270°. The angle between initial and final radius vectors is effectively 90°, so displacement chord = √(R²+R²) = 10√2 m.