21 A body moving with uniform acceleration is having velocity 2 m/s and 8 m/s at t = 1 s and t = 4 s respectively. Then average velocity of particle in the time interval t = 1 s to t 4 s is (1) 2 m/s (2) 3 m/s (4) 5 m/s (3) 5/3 m/s

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