Question

Three forces ($2\hat{i}-3\hat{j}+4\hat{k}$ ), ($8\hat{i}-7\hat{j}+6\hat{k}$) and m ($\hat{i}-\hat{j}+\hat{k}$) keep a body in equilibrium the value of m is

• A. 10
• B. -10
• C. 20
• D. -20

Answer 1

The correct option is A 10

$(2\hat{i}-3\hat{j}+4\hat{k})+(8\hat{i}-7\hat{j}+6\hat{k})=m(\hat{i}-\hat{j}+\hat{k})10(\hat{i}-\hat{j}+\hat{k})=m(\hat{i}-\hat{j}+\hat{k})=10$