# change in velocity

{ without right positive: {\displaystyle {\begin{matrix}{\overrightarrow {v}}_{initial}&=&+3m.s^{-1}\\&and&\\{\overrightarrow {v}}_{final}&=&-2m.s^{-1}\end{matrix}}} {\displaystyle {\begin{matrix}{\overrightarrow {v}}_{initial}&=&+3m.s^{-1}\\&and&\\{\overrightarrow {v}}_{final}&=&-2m.s^{-1}\end{matrix}}} Step 4 : magnets ferrofluid rare earth magnets rare earth magnets magnetic toys magnetic balls magnet balls strong…