Q 1 :    

A body of mass 4 kg experiences two forces ${\overrightarrow{F}}_1=5\hat{i}+8\hat{j}+7\hat{k}$ and ${\overrightarrow{F}}_2=3\hat{i}-4\hat{j}-3\hat{k}$. The acceleration acting on the body is                  [2024]

• $-2\hat{i}-\hat{j}-\hat{k}$

   

• $4\hat{i}+2\hat{j}+2\hat{k}$

   

• $2\hat{i}+\hat{j}+\hat{k}$

   

• $2\hat{i}+3\hat{j}+3\hat{k}$

   

Q 2 :    

A wooden block, initially at rest on the ground, is pushed by a force that increases linearly with time t. Which of the following curves best describes the acceleration of the block with time?        [2024]