Astudent, standing on a scale in an elevator at rest, sees that his weight is 997 n. as the elevator rises, the scale reads 1226 n and then returns to normal. when the elevator slows to a stop at the top floor, the scale reads 650 n and then returns to normal. determine the magnitude of the acceleration when the elevator is slowing to a stop. (no negative numbers)

(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.)