What elements comprise the largest portion of earth's biosphere?

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

The slope of a velocity time graph over any interval of time gives the during that interval