A horizontal bar 1.5 metres long and of small cross-section rotates about a vertical axis through one end. It accelerates uniformly from 1200 r.p.m. to 1500 r.p.m. in an interval of 5 seconds. What is the linear velocity at end of the interval?

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A horizontal bar 1.5 metres long and of small cross-section rotates about a vertical axis through one end. It accelerates uniformly from 1200 r.p.m. to 1500 r.p.m. in an interval of 5 seconds. What is the linear velocity at end of the interval?