Acceleration due to gravity (ag) = 9.8 m/s2. An object is dropped from a bridge. How fast will the object be falling in 6.3 seconds?

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?

Which notation is used to represent an alpha particle? a. b. c. d.

What is the difference between mass density and weight density?