An additional $3\mathrm{.}0$ kg block is now attached to the top of the original block and again, the composite block $(6\mathrm{.}0$ kg total$)$ begins atrest. A $15$ N push is now applied. The surface below applies a $q,$ friction force of magnitude

a$)$ static, $12$

$F_{sf}{}_s*mg$

$F_{sf}(0\mathrm{.}2)(6)(10)$

$F_{sf}12$

b$)$ static, $15$

c$)$ kinetic, $10$

d$)$ kinetic, $15$

e$)$ none of the above answers is correct

$F_{\text{p}\text{u}\text{s}\text{h}}>F_{sf}$

$15,{?}_{12}$