Question

A 15kg box is being pulled with a force of 60N and is sliding with an acceleration of 4 m/s^2. Find the coefficient of kinetic friction. 

Answer 1

$F=ma\to 60-\mu mg=ma\to \mu=(60-ma)/(mg)=$

$=(60-15\cdot 4)/(15\cdot9.8)=0$ . Answer