
Michael C. answered 01/31/17
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PhD with 20 years experience teaching math and applied science
U is 5m/s NE; V = 4 m/s N
change in velovity = vector V-U,
from the triangle of velocities that gives 3 m/s W (sorry I cannot illustrate this on this window, no graphics here !!!)
Assuming this change takes place uniformly, rate of change of velocity is vector (V-U)/t 3/2 m/s^2 = 1.5 m/s^2
From Newton's second law, force = mass * acceleration
Force = 650kg * 1.5 m/s^2 = 975 Newtons