Shoes made for the sports of boulderingand rock climbing are designed to provide a great deal of frictionbetween the foot and the surface of the ground. Such shoes on smoothrock might have a coefficient of static friction of 1.2 and a coefficient ofkinetic friction of 0.90. A person wearing these shoes stands on a smooth, horizontal rock. She pushes against the ground to begin running. What is the maximum horizontal acceleration she can have without slipping? (a) 0.20g; (b) 0.75g; (c) 0.90g; (d) 1.2g.

Shoes made for the sports of boulderingand rock climbing are designed to provide a great deal of frictionbetween the foot and the surface of the ground. Such shoes on smoothrock might have a coefficient of static friction of 1.2 and a coefficient ofkinetic friction of 0.90. A person wearing these shoes stands on a smooth, horizontal rock. She pushes against the ground to begin running. What is the maximum horizontal acceleration she can have without slipping? (a) 0.20g; (b) 0.75g; (c) 0.90g; (d) 1.2g.