A 110 g hockey puck slides across the frictionless surface of an ice rink at 2.2 m/s. It collides with a 420 g water bottle at rest on the ice. The water bottle slides off at 0.84 m/s in the direction of the puck's original velocity. What is the puck's final velocity?

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

i don't know that i agree with that but what's the question ?

conservation of mass

mass before something happens = mass afterwards