Question

The magnitudes of mutually perpendicular forces a, b and c are 2, 10 and 11 respectively. Then the magnitude of its resultant is

• A. 12
• B. 15
• C. 9
• D. None

Answer 1

Answer: (B)

15

Answer 2

$R = \sqrt { 4 + 100 + 121 } = 15$