A 4 kg block slides across a rough horizontal surface for 5 s. At time t = 5 s, it reaches a speed of 12 m/s at the bottom of a quarter-circle ramp of radius 4 m, where it slides with negligible friction. The coefficient of kinetic friction between the block
and the rough horizontal surface is Mo = 0.2. The block then slides along the ramp until the
block is launched vertically upward. A graph of the block's vertical speed as a function of
time after the block leaves the ramp is shown in Figure 2.

The magnitude of the change in speed of the block as it travels across the rough horizontal surface for 5s is most nearly:

A 2m/s
B 10 m/s
C 12 m/s
D 22 m/s