Kyle lays a mirror flat on the floor and aims a laser at the mirror. the laser beam reflects off the mirror and strikes an adjacent wall. the plane of the incident and reflected beams is perpendicular to the wall. the beam from the laser strikes the mirror at a distance =55.9 cm from the wall. the reflected beam strikes the wall at a height =38.9 cm above the surface of the mirror. find the angle of incidence thetai at which the laser beam strikes the mirror.

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.