Answer:
Coefficient of friction is at least 0.68
Explanation:
The maximum possible friction, [tex]F_r[/tex] is given by [tex]F_r=\mu R[/tex] where [tex]\mu[/tex] is coefficient of friction and R=mg where m is mass and g is acceleration due to gravity. For the object to move, the applied force must be greater than the frictional force hence for this case [tex]\mu\times 15\times 9.81=100\\\mu=\frac {100}{15\times 9.81}=0.6795786612300373768263676520557254502208\approx 0.68[/tex]
Therefore, it means the coefficient of friction is at least 0.68
