Two 72.0 kg hockey players skating at 7.00 m/s collide and stick together. If the angle between their initial directions was 120 degrees, what is their speed after the collision?

Answer 1

draw the figure. Notice symettry will allow for two components of momentum perpendicular to the line of symettry will cancel, so what is left is 2*72*7*cos60

Answer 2

A 74-kg canoeist stands in the middle of her 18-kg canoe. The canoe is 3.0 m long, and the end that is closest to land is 2.5 m from the shore. The canoeist now walks toward the shore until she comes to the end of the canoe.

calculate the distance from the canoeist to shore.