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The position vector of a moving body at any
instant of time is given as r =5t2i +5tj m .magnitude and direction of velocity at t = 2s is,
(1) 5 √ 15 m/s, making an angle of tan–1 4 with Y axis
(2) 5 √ 15 m/s, making an angle of tan–1 4 with X axis
(3) 5 √ 17 m/s, making an angle of tan–1 4 with Y axis
(4) 5 √ 17 m/s, making an angle of tan–1 4 with X axis
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