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Vector calculus — Question 109

Original QCE Vault practice · 1 mark

Q109 · Practice questionSimple familiar1 mark

QUESTION 109

For r(t)=(3cos⁡t,2sin⁡t)\mathbf r(t)=(3\cos t,2\sin t), the angle between velocity and acceleration at t=π/4t=\pi/4 is approximately
(A)
22.6∘22.6^\circ
(B)
45.0∘45.0^\circ
(C)
67.4∘67.4^\circ
(D)
90.0∘90.0^\circ
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