Two air track carts move toward one another on an air track. Cart 1 has a mass of 0.45 kg and a speed of 1.1 m/s. Cart 2 has a mass of 0.65 kg
(a) What speed must cart 2 have if the total momentum of the system is to be zero?
(b) Since the momentum of the system is zero, does it follow that the kinetic energy of the system is also zero?
(c) Verify your answer to part (b) by calculating the system's kinetic energy

We're always up for a good laugh, but, seriously, refrain from posting silly or answers. keep the quality of high by following the rules and posting thoughtful answers.

Which of the following situations would most likely occur if a human-induced event caused the ocean water to become the same temperature around the world? deep ocean current circulation would increase salt distribution around the world's oceans. surface ocean current circulation would distribute heat around land masses at a faster rate. new, fresher water would float on top of dense salt water and limit thermohaline circulation. some land masses in the northern hemisphere would start to warm up over time, melting snow and ice. runoff of surface freshwaters and rainfall would no longer have an effect on the salinity of ocean waters.

List and define the two main problems when heavy pumping of wells occurs?