Three blocks in contact with each other are pushed across a rough horizontal surface by a
73 N force as shown.
The acceleration of gravity is 9.8 m/s2.

If the coefficient of kinetic energy between each of the blocks and the surface is 0.16 find the magnitude of the force exerted on the 7.2kg block by the 6.6 kg block
Answer in units of N

(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.)