## University Physics with Modern Physics (14th Edition)

(a) $J = \Delta p = m \Delta v$ $J = (0.057~kg)(73~m/s)$ $J = 4.2~kg~m/s$ We can use the impulse to find the force. $F~t = J$ $F = \frac{J}{t} = \frac{4.2~kg~m/s}{0.0300~s}$ $F = 140~N$ Big Bill exerted an impulse of 4.2 kg m/s and a force of 140 N. (b) $J = \Delta p = m \Delta v$ $J = (0.057~kg)(55~m/s+73~m/s)$ $J = 7.3~kg~m/s$ We can use the impulse to find the force. $F~t = J$ $F = \frac{J}{t} = \frac{7.3~kg~m/s}{0.0300~s}$ $F = 240~N$ Big Bill's opponent exerted an impulse of 7.3 kg m/s and a force of 240 N.