If the particle is moving along a straight line given by relation x=2-3t+4t^2 where s is in cms.,and t in sec.its average velocity during the third sec.
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differentiating with respect to time
dx/dt=-3+8t
Now velocity at t=3
dv=-3+24
dv=21
dx/dt=-3+8t
Now velocity at t=3
dv=-3+24
dv=21
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