Which graph best represents the relationship between gravitational potential energy (PE) and height above ground (h)

If you mix chlorine lithium and nickel together which two elements would be the most reactive

Describe the path of a ray that approaches a mirror parallel to the principal axis.

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 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?