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Physics Help - Momentum?
A boxer, with a 5kg fist, punches a heavy bag (mass 25kg) with velocity 25m/s. If the punch contacts the bag for 0.3s, calculate the acceleration of the heavy bag.
1 Answer
- JaredLv 71 decade agoFavorite Answer
This is an impulse question:
F = dp/dt
I assume that the entire momentum is transferred to the bag so:
F = p / .3s
where p = mv = 5kg * 25m/s
F = 125 / .3 = 125 * 10 / 3 = 1250 / 3 = 416.666 N
then F = ma
a = F / m = (1250/3) / 25 = 5 * 10 / 3 = 50/3 = 16.6666 m/s/s
