# A hand pushes two blocks, block A and block B, along a frictionless table through a distance d

A hand pushes two blocks, block A and block B, along a frictionless table through a distance d. The mass of block A is greater than the mass of block B, mA >mB.

(a) Draw a FBD for each block. Does block A do work on block B? If so is the work positive or negative?
Does block B do work on block A? If so is the work positive or negative? If each block does work on the
other, compare the works in magnitude and sign. Explain your reasoning.

(b) How does the net force on block A compare to the net force
on block B? What does your result imply about how the net work done
on block A compares to the net work done on block B? Explain.

(c) How do the final kinetic energies of the blocks compare? Use

(d) The initial speed of the two blocks is v0 = 2 m/s to the right.
Suppose that the work done on block A by the hand during a given
displacement is 10 J. The mass of block A, mA = 4kg, and the mass of
block B, mB = 1kg. Calculate the final kinetic energy of each block.