Answer
(a) Big Bill exerted an impulse of 4.2 kg m/s and a force of 140 N.
(b) Big Bill's opponent exerted an impulse of 7.3 kg m/s and a force of 240 N.
Work Step by Step
(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.
