Plz ! will upvote!
how are mass and weight different?

mass is the space an object takes up and weight is the effect of gravity on mass.
mass is the amount of matter and weight is the effect of gravity on mass.
weight is the amount of matter and mass is the effect of gravity on weight.
weight is the space an object takes up and mass is the effect of gravity on mass.

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)