Answer: The momentum of the ball is 1.87 g m/s.
Step-by-step explanation:
Momentum of an object is defined as the product of mass of the object and the velocity of the object. Mathematically,

where,
p = momentum of the ball = ? g m/s
m = mass of the ball = 2.20 grams
v = velocity of the ball = 0.850 m/s
Putting values in above equation, we get:

Hence, the momentum of the ball is 1.87 g m/s.