1.

Whichof the following relations are correct for any type of motion ? (A) vecv_(av)=1/2[vecv(t_1)+vecv(t_2)] (B) vecv_(av)=(vecr(t_2)-(t_1))/((t_2-t_1)) (C ) vecv(t)=vecv(0)+vecat (D) vecr(t)=vecr(0)+vecv(0)*t+1/2vecat^2 (E) veca_(av)=(vecv(t_2)-vecv(t_1))/((t_2-t_1)) All the symbols have usual meaning. The subscript 'av' has been usedto denote the average of a quantity in the time interval t_1 to t_2.

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ANSWER :B and E


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