Which type of energies make up the mechanical energy of a roller coaster moving along a track?

Most energy in an ecosystem comes originally from_

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?