A cart traveling at 15m/s speeds up with a constant acceleration of 2.0m/s^2 for 15 seconds. What is the new velocity? a.) 30m/s
b.) 15m/s
c.) 45m/s
d.) 450m/s
e.) 60m/s

(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.)