Which of the following would increase the strength of an electromagnet?

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

What’s #16 asking me and how do i solve it?

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?