© Dr. Steve Rapp, 2004

Sample Problems

uA
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?

uJ = F t = 300 N (15
s) = 4500 N s

uJ = p and p =
mv: therefore

uv = p/m = __4500 N s __= 4.5 m/s

100 kg