you and a friend launch waves at opposite ends of the stretched string after class. you shake the string at 5 hz with a 15 cm amplitude, and your acquaintance shakes the other end at 2 hz with a 10 cm amplitude. what is the largest (most positive) displacement in cm of the string at any point at any time? explain. b. is your wave faster? explain.

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.)