1 . r3⇀=2i^+4j^-5k^

• A. $\frac{2}{7}\hat{i}+\frac{4}{7}\hat{j}+\frac{5}{7}\hat{k}$
• B. $\frac{1}{7}\hat{i}+\frac{2}{7}\hat{j}+\frac{3}{7}\hat{k}$
• C. $\frac{3}{7}\hat{i}+\frac{6}{7}\hat{j}\frac{2}{7}\hat{k}$
• D. $\frac{3}{5}\hat{i}+\frac{6}{5}\hat{j}\frac{2}{5}\hat{k}$

Answer: Option C

Explanation:

2 . P⇀=2i^+2j^-k^

• A. $-\hat{i}-2\hat{k}$
• B. $-3\hat{i}-6\hat{k}$
• C. $\frac{-3\left(t+2\hat{k}\right)}{\sqrt{45}}$
• D. $\frac{-3\left(t-2\hat{k}\right)}{\sqrt{45}}$

Answer: Option C

Explanation:

3 . ভেক্টর কোনটি?

• A. দূরত্ব
• B. সময়
• C. ওজন
• D. আয়তন

Answer: Option C

Explanation: