Aparticle moves on a coordinate line with acceleration startfraction d squared s over dt squared endfraction equals 45 startroot t endroot minus startfraction 15 over startroot t endroot endfraction , subject to the conditions that startfraction ds over dt endfraction equals 9 and sequals12 when t equals 1. find the velocity v equals startfraction ds over dt endfraction in terms of t and the position s in terms of t.

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?

Acar is traveling 35 mph on a smooth surface . if a balanced force is applied to the car what happens?

Which of the following statements correctly describes a transformer?