What is the correct way to write the postal abbreviation for the state of pennsylvania

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z