The chart shows masses and velocities of four objects. which lists the objects in order, from least to greatest momentum?
a. w, x, y, z
b. z, y, x, w
c. z, x, w, y
d. y, w, x, z

Momentum is the product of mass x velocity.

p = mv

Where: p = momentum
             m = mass
             v = velocity

Now you can answer your question by finding the momentum of each:

p = mv
p(w) = 12 x 5 = 60
p(x) = 15 x 8 = 120
p(y) = 18 x 2 = 36
p(z) = 28 x 10 = 280

With that you can now arrange them in ascending order (least to greatest):
 Y < W < X < Z

Your answer is D.