The change in momentum is (magnitude) 2 kg m/s
Explanation:
The change in momentum of an object is given by
where
m is the mass of the object
v is the final velocity
u is the initial velocity
Since momentum is a vector, it is important to correctly take into account the sign (therefore, the direction) of the velocities.
For the ball in this problem, we have:
m = 0.2 kg is the mass
u = 6 m/s (taking east as positive direction)
v = -4 m/s (west is negative direction)
So the change in momentum is
And since we are only interested in the magnitude, the answer is
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