Physics - NLM Question with Solution | TestHub

$f=\mu \text{mg}\widehat{\text{i}}\text{before collision and}f=\mu \text{mg}\widehat{i}\text{after collision}$

$f=0\text{before collision and}f=+\mu \text{mg}\widehat{i}\text{after collision}$

$f<\mu \text{mg}\widehat{\mathrm{}\mathrm{i}}\text{before collision and}f=\mu \text{mg}\widehat{i}\text{just after collision}$

$f=\mu \text{mg}\text{before collision and}\text{just after collision}$