Question

a boxer rides with the punch so as to reduce ________. view available hint(s) force impulse momentum speed submit provide feedback

Explanation:

To solve this, we recall the concepts of impulse, force, momentum, and speed. Impulse ($J$) is defined as the change in momentum ($\Delta p$) and is also equal to the product of force ($F$) and time ($t$), i.e., $J = F \times t=\Delta p$. When a boxer rides with the punch, they increase the time of impact ($t$). Since the impulse (change in momentum) of the punch is fixed (because the change in momentum of the punch - from its initial momentum to when it stops - is determined by the punch's characteristics), from $F=\frac{J}{t}$, increasing $t$ will decrease the force $F$ exerted on the boxer.

• Impulse: The impulse of the punch (change in its momentum) is not reduced because the punch's initial and final momentum (when it interacts with the boxer) is fixed, so impulse remains the same.
• Momentum: The momentum change of the punch (impulse) is fixed, and the boxer's action doesn't reduce the punch's momentum change.
• Speed: Riding with the punch doesn't directly reduce the speed of the punch in a way that's the primary effect here; the key is about force and time.

So the boxer rides with the punch to increase the time of impact, thereby reducing the force.

Answer:

A. force