A9.30 kg mass is moving at a constant velocity of 4.00 m/s.

what magnitude force is needed to bring the mass to rest in 8.47 s?
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how far does the mass move while the force is acting?

(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.)