A 1 175.0 kg car traveling initially with a speed of 25.000 m/s in an easterly d

Question

A 1 175.0 kg car traveling initially with a speed of 25.000 m/s in an easterly direction crashes into the back of a 9 900.0 kg truck moving in the same direction at 20.000 m/s. The velocity of the car right after the collision is 18.000 m/s to the east.

A 1 175.0 kg car traveling initially with a speed of 25.000 m/s in an easterly direction crashes into the back of a 9 900.0 kg truck moving in the same direction at 20.000 m/s. The velocity of the car right after the collision is 18.000 m/s to the east. What is the velocity of the truck right after the collision? (Give your answer to five significant figures.) What is the change in mechanical energy of the car-truck system in the collision? Your response differs from the correct answer by more than 100%. J Account for this change in mechanical energy.

Explanation / Answer

1). conserving momentum we get

m1u1+m2u2=m1v1+m2v2

1175*25+9900*20=1175*18+9900*v

so v= 20.8308 m/s to east

b).it is KE final-KE initial

=-8881.22J

c).it has been changed because the colloision is not perfectly elastic

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