A roller coaster car is at the top of a 65.0 m crest. If the roller coaster car has 987,000 J of potential energy, what is its mass?

Natural forces that can alter ecosystems include seasons and climate changes. t or f

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Blank liquids and gases exert a buoyant force on objects placed in them