If you are give the x and y components of two vectors and P and Q Px = 3,Py=6 and Qx=8 and Qy = 10 find the angle between P and Q.

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?