©
Dr. Steve Rapp,
2004
Sample Problems
u
A gust of wind exerts a 300 N net force on a
100 kg sailboat for 15 sec.
What is the
change in momentum and velocity of the
boat?
u
J = F
t = 300 N (15 s) = 4500 N s
u
J =
p and p = mv:
therefore
u
v = p/m =
4500 N s
= 4.5 m/s
100 kg