Which property describes the rate at which waves pass by?
A. Period
B. Frequency
C. Wavelength
D. Speed

Number of electron i think

Gravity, from the center of mass of the box, extending downward normal force, from the floor under the box, extending upward, equal to gravity push force, acting at a point on the box, extending in the direction of motion friction, acting at any point on the box directly opposite the push, extending directly opposite to the motion