1. Consider the vectors A=4.00[cm]i^+3.00[cm]j^ and B=3.00[cm]i^+4.00[cm]j^. With respect to the x-axis, what is the direction of the resultant vector A+B ?

2. Sam is above Kate, and a distance of 206[m] separates them. Sam hit a ball vertically downward with a speed of 86.0[m/s], while Kate simultaneously hit another ball upward at 92.0[m/s]. How long after launch did it take for both balls to collide?

3. A 6.90 kg block is at rest on a rough inclined plane. The incline angle is increased to 67.8, the block starts sliding down the incline. Give the coefficient of static friction between the block and the inclined plane.