A block is travelling on a horizontal frictionless surface. While it moves in the direction of the force $F$, a constant force $F$ and a constant resistive force of $5.0\ \text{N}$ act on the block, as shown. The graph illustrates how the momentum of the block changes with time. What magnitude does force $F$ have?
- A$2.0\ \text{N}$
- B$3.0\ \text{N}$
- C$5.0\ \text{N}$
- D$8.0\ \text{N}$