Block A of mass 4 kg is moving on the smooth surface to the right at
7(m)/(s)
when it squarely strikes block
B
, which is at rest and has a mass of 7 kg . If the coefficient of restitution is 0.4 , determine the velocity of block A. Enter in
x.\times (m)/(s)
format Note: The coefficient of restitution is a measure of energy loss during an impact. This energy goes into the generation of sound, light, heat, and permanent deformation. The equation is on the course equation sheet:
e=(v_(B_(2))-v_(A_(2)))/(v_(A_(1))-v_(B_(1)))
Since the system only has an equal and opposite reaction force between the two masses, there is a net 0 impulse and therefore a net 0 change in linear momentum:
m_(A)v_(A_(1)) m_(B)v_(B_(1))=m_(A)v_(A_(2)) m_(B)v_(B_(2))