The graph shows a variable force F that acts on an object as it moves along a straight line as a function of time t. What is the change in momentum of the * ? object from t =1s to t = 48 F(N) V 2 t(s) 0 1 2 3 1.5 kg m/s O 7.5 kg m/s O 2 kg m/s O 8 kgm/s O 15 kgm/s O