To calculate power (P) when speed (V) is given, we can use the formula:

P = F * V

Where:
P = Power in watts (W)
F = Force in Newtons (N)
V = Velocity in m/s

V = 9 km/h = 9 * 1000 m / 3600 s = 2.5 m/s

Given that P = 220 watts and V = 2.5 m/s, we can rearrange the formula to solve for force (F):

F = P / V
F = 220 / 2.5
F = 88 Newtons

Therefore, the force is 88 Newtons.