Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be (A) a) the same as before. (B) b) zero. (C) c) small, but noticeable.

When you **throw a heavy ball while standing on roller skates**, you're applying a force to the ball to propel it forward. According to Newton's third law of motion, the ball exerts an equal and opposite force back on you, resulting in a noticeable recoil that pushes you backward. However, if you **go through the motions of throwing the ball but hold onto it**, you're still applying and experiencing forces during the motion. Despite this, because you're holding the ball, the forces you exert to "throw" the ball are internal to the system (you plus the ball). These internal forces cancel each other out, resulting in **no net external force**. Therefore, there is **no noticeable recoil** in this scenario. **Answer:** **(B) b) zero.**