What is the maximum speed when the conditions are mass =450 kg, initial height= 30 m, and the roller coaster is initially at rest? A. 30 m/s
B. 24.2 m/s
C. 93.9 m/s
D. 132, 300 m/s

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

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

Explain what will happen if decomposers were apsent from a forest ecoysystem.