How much work is done when a 48-kg stack of books are lifted 2m with a net force of 25 n ?
a. 12.4 j
b. 100 j
c. 50 j
d. 96 j

Asimply means that over time there was some sort of change.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.