The borinontal surface on which the block slides is fisctionless The speed of th

Question

The borinontal surface on which the block slides is fisctionless The speed of the biesek befuxe it oaches the spring is 10 's. Hew fast is the block meving at he inatani he spring has been e. 7.6m 5. A 1500 kg car traveling at 20 m's collides direculy with the buck of a 3000 kg truck traveling at 10 ms and they stick together (thcy buth were and ure traveling on the same line of motion and they initially were traveling in the same dircction). What is their speed right after they stick together? a. 10.11 m/s b. 12.15 m's c. 13.33 m's d. 20.13 ms e. 5.56 m/s

Explanation / Answer

5) by the conservatioin of momentum we have

m1u1 + m2u2 = (m1+m2)*V

1500*20 + 3000*10 = (1500+3000)*V

V = 13.33m/s

so option c) 13.33 m/s is the correct answer

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