Determine the angle between the two vectors r1 and r2
F = -3i - j + 5k kN
r1 = -5i + 10k - 5j m
r2 = 5i -10k + 5j m
A) Determine the angle between the two vectors r1 and r2.
B) Determine the projection of the force F along the position vector r1.
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