Question

Question) A body of mass 5 kg is moving with velocity of $\overrightarrow{V}=(2\hat{i}+6\hat{j})m/s$ at t = 0.5 , After time t = 2 s , Velocity of body is $(10\hat{i}+6\hat{j}),$ then change in momentum of body is what ?

Answer 1

Dear Student ,
Change in momentum is ,
$∆\overrightarrow{p}=\overrightarrow{p_f}-\overrightarrow{p_i}=\left(m\overrightarrow{v_f}-m\overrightarrow{v_i}\right)=m\left(\overrightarrow{v_f}-\overrightarrow{v_i}\right)=5[\left(10\hat{i}+6\hat{j}\right)-\left(2\hat{i}+6\hat{j}\right)]=40\hat{i}$
Regards