Question

The resultant of two vectors of magnitudes 2A and
route2 A acting at an angle thetha is route10 A. The correct value
of is
(a) 30degree
(b) 45degree
(c) 60°
(d) 90degree​

Answer 1

b) 45°

R^2 = a^2 + b^2 + 2abcos©

(√10A)^2 = (2A)^2 + (√2A)^2 + 2 (2A)(√2A)cos©

10A = 4A + 2A + 4√2Acos@

4A = 4√2Acos@

cos@= 1/√2

cos@ = cos 45°

Answer 2

Answer:

iiiiiihvcgjbtDuwjwheh