Question

The resultant of two vectors of magnitudes 2A and √2 A
acting at an angle ois √10 A. The correct value of 0 is :
(a) 30°
(b)45°
(d) 90°
(0)60°​

Answer 1

Explanation:

B 45 it is tan 45 so there the option b

Answer 2

Answer:B) is right ans

Explanation:

R=√10A and two vectors are 2A and √2A

So

R²=p²+q²+2pq cos theta

(√10A)²= (2A)²+(√2A) ²+2×2A×√2A cos theta

10A²= 6A²+4√2A²cos theta

10A²-6A²= 4√2A²cos theta

4A²/4√2A²= cos theta

Cos theta=1/√2= 45°