Answer:
the change in the kinetic energy of the system is -42.47 J
Step-by-step explanation:
Given;
mass A, Ma = 2 kg
initial velocity of mass A, Ua = 15 m/s
Mass M, Mm = 4 kg
initial velocity of mass M, Um = 7 m/s
Let the common velocity of the two masses after collision = V
Apply the principle of conservation of linear momentum, to determine the final velocity of the two masses;
The initial kinetic of the two masses;
The final kinetic energy of the two masses;
The change in kinetic energy is calculated as;
Therefore, the change in the kinetic energy of the system is -42.47 J