If a body moves along a circular path, covering only half the circle, what would be its displacement and distance travelled, respectively?
(1) circumference and diameter
(2) half the circumference and radius
(3) diameter and half the circumference.
(4) radius and circumference.
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Answer:
Displacement is the shortest distance travelled from the initial point to the final point. After half revolution the displacement is the length of the diameter which is equal to 2r. Hence the displacement is 2r.
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