A 1 300.0 kg car traveling initially with a speed of 25.000 m/s in an easterly d

Question

A 1 300.0 kg car traveling initially with a speed of 25.000 m/s in an easterly direction crashes into the back of a 8 800.0 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) What is the velocity of the truck right after the collision? (Give your answer to five significant figures.) _________ m/s east?

(b) What is the change in mechanical energy of the car?truck system in the collision? _____________J ??

Explanation / Answer

a) 1300 * 25 + 8800*20 = 1300*18 + 8800*vfT >>>>>>>>> vfT = 21.034 ? 21.0 m/s >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> b) 0.5*(1300*25*25+8800*20*20-1300*18*18-8800*21.034*21.034) = 8960 J

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