All object accelerate towards the earth at what speed?

9.8 meters per second.

Objects fall to the ground at the same rate because the acceleration due to gravity is the same for all objects. All objects accelerate towards earth at a rate of 9.8 meters per second. this means that for every second that an object falls, the objects downward velocity increases by 9.8 m/s.

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.