If a box has equal and opposite forces acting on it, will the box accelerate?

The differences between  a compression wave and a transverse wave?

Can anybody me with this? ? (picture included.)

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.