A weight W is now placed on the block and

Question

7.7 N is needed to push them both at constant
velocity.
What is the weight W of the block?
Answer in units of N.

Answer 1

Information from a previous question, probably about the coefficient of friction, is needed to answer this.

Answer 2

What you need to do is use the equation
Ffriction=coefficient of friction*Normal.
and remember that normal is the total weight of the objects.