Homework Answers
1.
Momentum = Mass*Velocity
P = m*V
P = 90*5 = 450 kg-m/sec
2.
A = (1, 3) = i + 3j
B = (-1, -3) = -i - 3j
C = A + B
C = (i + 3j) + (-i - 3j) = 0 i + 0 j
C = (0, 0) m
D = A - B
D = (i + 3j) - (-i - 3j) = i + 3j + i + 3j
D = 2i + 6j = (2, 6) m
|D| = sqrt (2^2 + 6^2) = 6.32 m
Direction = arctan (6/2) = 71.56 deg Counter-Clockwise to +x-axis
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