A student pushes a wooden block across a rough horizontal floor at constant speed by applying a horizontal force Fpush to the right. Which of the following lists includes every force that should appear on a correct free-body diagram of the block—and no additional forces?
a) Fpush (hand on block); kinetic friction (floor on block); weight (Earth on block)
b) Fpush (hand on block); weight (Earth on block); normal force (floor on block)
c) Fpush (hand on block); kinetic friction (floor on block); weight (Earth on block); normal force (floor on block)
d) Fpush (hand on block); kinetic friction (floor on block); weight (Earth on block); normal force (floor on block); reaction to push (block on hand)