1) A ray of light that strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane
mirror and then strikes a second plane mirror QR
placed at 110° angles to the first mirror. The angle of
reflection at the second mirror is:
(a) 30°
(b) 45°
(c) 50°
(d) 900

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)