A student throws a stone upward at an angle of 45° above the horizontal. Which statement best
describes the stone at the highest point that it
reaches?

(1) Its acceleration is zero.
(2) Its acceleration is a minimum, but not zero.
(3) Its gravitational potential energy is a
minimum
(4) Its kinetic energy is a minimum

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

their crystal patterns have been disrupted by stress