In the "before" part of Figure, car A (mass 1100 kg) is stopped at a traffic light when it is rear-ended by car B (mass 1400 kg). Both cars then slide with locked wheels until the frictional force from the slick road (with a low μK of 0.13) stops them, at distances dA = 8.2m and dB = 6.1m. What are the speeds of
(a) Car A and
(b) Car B at the start of the sliding, just after the collision?
(c) Assuming that linear momentum is conserved during the collision, find the speed of car B just before the collision.
(d) Explain why this assumption may be invalid.