Two students are on a balcony 19.6m above the street. one student throws a ball vertically downward at 14.7 m/s. At the same instant the other student throws a ball vertically upward at the same speed. the second ball just misses the balcony on the way down. a. what is the difference in the time the balls spend in the air?

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?