//Example 4.4
//Also see Example 4.3
m=12+7;//Total mass of System 2, mass of cart+mass of equipment, (kg)
a=1.5;//Acceleration (m/s^2), See Example 4.3
F_net=m*a;//Net external force (N)
f=24;//Net opposing force (N)
F_prof=F_net+f;//Force exerted by the professor on the cart (N)
printf('Force exerted by the professor on the cart = %0.1f N',F_prof)
//Answer varies due to round off error
//Openstax - College Physics
//Download for free at http://cnx.org/content/col11406/latest