Question

velocity of particle after $1s$ (Take $g=10m/s^2$)

• A. $(20\hat{i}+10\hat{j})m{s}^{-1}$
• B. $(10\hat{i}+20\hat{j})m{s}^{-1}$
• C. $(10\hat{i}+10\hat{j})m{s}^{-1}$
• D. $(20\hat{i}+20\hat{j})m{s}^{-1}$

Answer 1

The correct option is A $(20\hat{i}+10\hat{j})m{s}^{-1}$

$\overrightarrow{v}=\overrightarrow{u}+\overrightarrow{a}t\Rightarrow \overrightarrow{v}=20\hat{i}+20\hat{j}+(-10\hat{j})\times 1=20\hat{i}+10\hat{j}$