Which of the following statements is/are incorrect?
(A) Arm length or a footstep was used as a unit of length in olden days.
(B) The needle of a sewing machine undergoes circular motion.
(C) Motion of a body thrown upward at an angle is rectilinear motion,
(D) Multiples and submultiples of a unit are used for measurement of bigger or smaller quantities.
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statement b is incorrect because neddle of machine undergoes periodic motion
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