Check b and c plz :DD

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

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

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.