12. A car of mass 1500 kg collides head-on with a parked truck of mass 3000 kg. Spring mounted
bumpers ensure that the collision is essentially elastic. If the velocity of the truck is 18 km/h (in the
same direction as the car's initial velocity) after the collision, what was the initial speed of the car?
(A) 18 km/h
(B) 38km/h
(C) 27km/h
(D) 10km/h
(E) 54km/h
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統計: A(0), B(2), C(12), D(0), E(4) #3081252
統計: A(0), B(2), C(12), D(0), E(4) #3081252