Two people, each with a mass of 70 kg, are wearing inline skates and are holding opposite ends of a 15m rope. one person pulls forward on the rope by moving hand over hand and gradually reeling in more of the rope. in doing so, he exerts a force of 35n [backwards] on the rope. this causes him to accelerate toward the other person. assuming that the friction acting on the skaters is negligible, how long will it take for them to meet? explain your reasoning.

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

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

If the area of a square has increased by a factor of 16, by how much has each side increased?