How fast must a 250 Gram cart be traveling to have a momentum of 0.450 kg m/s?

What are the three ways that an object can accelerate

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?

Notice how they put future which of the clouds shown would indicate a possible future rain storm? a) b) c) d)