What does a negative acceleration mean if the object has positive velocity?

An object which moves in the positive direction has a positive velocity.  If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion .  If velocity and acceleration have opposite signs, you slow down. Negative velocity = You move backwards. Negative acceleration - You slow down or you go faster in the backwards direction

Explanation:

Explanation:

An object which moves in the positive direction has a positive velocity.

If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion aka negative velocity.

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