d. 2) e-jk ді д a a. Some ejk (Xs - X)?dx/d is Fresnel Integral b. Diffraction c. Fraunhofer d. Superposition​

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.

An open cart is moving along a straight frictionless horizontal track. when rain starts falling vertically into the cart, what happens to the speed of the cart?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?