A constant horizontal force of 30 N is exerted by a string attached to a 5-kg block being pulled across a tabletop. The block also experiences a frictional force of 5 N due to contact with the table.
a. What is the horizontal acceleration of the block?
b. If the block starts from rest, what will its velocity be after 3 seconds?
c. How far will it travel in these 3 seconds?