If the velocity of a particle is u = At + Bt2,where A and B ate constants, then the distance travelled by it between 1s and 2s is :
32A+4B
3A +7B
32A+73B
A2+B3
V=At−Bt2⇒dsdt=At+Bt2⇒∫0sds=∫12At+Bt2dt⇒s=A222−12+B323−13=3A2+7B3