If an element has a charge of 3+ how many more protons does it have than electrons

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Can someone me with my physics questions? i need correct answers only!