The force of gravity on the block is 2.4 * 9.8, or 23.52, Newtons. To hold the block, there must be a net vertical force of zero on the object; therefore, she must produce enough force for their to be at least 23.52N of friction on the object. Since

*µ*_{s} is 0.32, then it's just the equation 23.52 = 0.32 *

*F*_{normal}. Solve for

*F*_{normal} to find the force she is exerting and you get ~73-74. So I pick the multiple choice answer around that