Question

3. If A= B + C and have A, B and C scalar magnitudes of 5,4 and 3 units respectively, then
the angle between A and C is
(a) cos-1 (3/5) (b) cos-1 (4/5) (c) T/2 (d) sin-1 (3/4)​

Answer 1

Answer:

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Answer 2

Explanation:

Let angle between A and C be θ so that Acosθ=C.

That gives θ=cos

−1

(3/5).

Please note that A, B and C form the sides of a right angled triangle with A as the hypotenuse.