25. an the 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 (3) 5/3 m/s (4) 5 m/s

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( A t quad t=18, quad u=2 m / s ) ( t=48 v=8 m / s ) ( a=frac{8-2}{3}=frac{6}{3}=2 m 8^{-2} ) ( v^{2}-v^{2}=2 a s ) ( Rightarrow 8^{2}-2^{2}=2 times 2 times 5 ) ( =60=4 times 5 ) ( S=15 mathrm{m} ) Average velocity ( =frac{s}{Delta t}=frac{15}{4-1}=frac{15}{3}=5 mathrm{ms} ) ( (4)^{A n} )

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