Most athletic shoes have coefficients of static friction of 0.80 on a tile surface. What is the minimum time in which a person at rest could move 3 meters on this surface if they start from rest?

Question

anonymous · Answer

wat is acc(deceleration) caused by frictional force?

anonymous · Answer

Fapp-f=ma?

anonymous · Answer

dont consider the force that u give to sustain its motion
wat is the minimum time required to move 3m that is time taken while the decelerating force (acceleration that is)
F=ma=0.8*mg
so 
a=?

anonymous · Answer

So a=7.84m/s2? What about the 3 meters?

anonymous · Answer

consider the frictional force to be uniform
and use the eqns for uniform acceleratiun
u know them?

anonymous · Answer

uhh do you mean: fsmax=$$\mu s * \eta$$ and fk=$$\mu k * \eta$$

anonymous · Answer

u r right 
F-Ff=ma
a-a0=A(net)
where F is the force u give to more it
Ff is frictional force=mg*mui
a0=g*mui
find net acc Anet
u know eqns 4 uniform acc?