Two figure skaters are coasting in the same direction, with the leading skater moving at 5.0 m/s and the trailing skater, who is moving at 5.9 m/s. When the trailing skater catches up with the leading skater, he picks her up without applying any horizontal forces on his skates. If the trailing skater is 75% as massive as the 75 kg leading skater, what is the energy loss in this system due to the collision?

Pick the correct answer

A.-1909 J

B.-303.1 J

C.-4789 J

D.0 J

E.-13.0 J

F. None of these are correct

2.-Two train cars weighing m_1 = 1000 ,mathrm{kg}m1=1000kg and m_2 = 2500 ,mathrm{kg}m2=2500kg are on nearly frictionless track under a hill. Car 1 strikes car 2 with velocity v_0 = 35 ,mathrm{m/s}v0=35m/s and rebounds with velocity v_1 = 6 ,mathrm{m/s}v1=6m/s in the opposite direction. What height hh does car 2 reach before stopping if the collision is instantaneous?

 

Pick the correct answer

A.6.9m

B.1.67m

C.13.7m

D.27.4m

E.24.3m

F.None of these are correct.

2 1 h