A ball was dropped from rest from level “A” (12 m above the liquid surface, level “B”). Through the liquid,
the ball was applied by deceleration of 120t4 m/s?,
where t is the time in seconds, the ball stopped at level
"C". Calculate:
a) The velocity of the ball at "B"
b) The time taken by the ball from "B" to "C"
C) The distance between "B" and "C"​

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?