The coefficient of static friction is 0.768 between the soles of a 60.0 kg sprinter's running shoes and the level track surface on which she is running. Determine the maximum acceleration she can achieve.

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

correct it is c.) b b

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

i would say