The maximum speed of a child on a swing is 4.2 m/s. the child's height above the ground is 0.40 m at the lowest point in his motion. how high above the ground is he at his highest point?

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

Which two particles are found in the center of an atom

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?