During an experiment, a student records the net horizontal force exerted on an object moving in a straight line along a horizontal frictionless track. The graph above shows the force as a function of time. Of the following, which is the best approximation of the magnitude of the change in momentum of the object between 0 s and 4 s?

Two carts mounted on an air track are moving toward one another. Cart 1 has a speed of 1.0 m/s and a mass of 0.47 kg. Cart 2 has a mass of 0.71 kg.(a) If the total momentum of the system is to be zero, what is the initial speed (in m/s) of Cart 2? (Enter a number.) m/s(b) Does it follow that the kinetic energy of the system is also zero since the momentum of the system is zero? YesNo     (c) Determine the system's kinetic energy (in J) in order to substantiate your answer to part (b). (Enter a number.) J

Two carts mounted on an air track are moving toward one another. Cart 1 has a speed of 1.2 m/s and a mass of 0.46 kg. Cart 2 has a mass of 0.67 kg. (a) If the total momentum of the system is to be zero, what is the initial speed (in m/s) of Cart 2? (Enter a number.) m/s (b) Does it follow that the kinetic energy of the system is also zero since the momentum of the system is zero? O Yes O No (c) Determine the system's kinetic energy (in J) in order to substantiate your answer to part (b). (Enter a number.)

A 650.0-kg car makes a 90° turn. Its speed before the turn is 23.0 m/s and after the turn it is 27.6 m/s.   Calculate the magnitude of the change in the car's momentum.