Trains A and B travel on parallel tracks. Train A has a speed of 40km/h and is slowing at the rate of 2m/s2, while train B has a constant speed of 40km/h. Determine the velocity and acceleration of train B relative to train A .

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?