4. A block of mass m= 5.00 kg is released from rest from point A and slides on the frictionless track shown in in the diagram. Determine (a) the block's speed at points
B and C and (b) the net work done by the gravitational force on the block as it
moves from point from A to C.​

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

Which composition of water moves to begin a deepwater current?

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?