Horizontal displacement?

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves

What is a carrier wave and how does it affect what you hear on the radio