-8 '0'! I. .'o I A stationary eart attached to a force gauge is on a straight: horizontal: 'ietionless track. A student uses the force gauge to move the cart: and the gauge produces the graph of force as a function of time shown above. How does the momentum of the cart change during the time interval [I s to 21] s 7' {A} The momentum increases in magnitude during the entire time interval. (13) The momentum decreases in magnitude during the entire time interval. (C) The momentum 'inereases in magnitude at first= then decreases and reverses direction. {D} The momentum increases. in magnitude at first= then decreases without reversing direction