Question

Three blocks (1,2,3) of mass 3.00 kg, 2.00 kg, 1.00 kg sit linearly 10.0 cm apart from each other on a frictionless surface. A 25 g bullet is shot at the first block, it travels through the first block, and embeds itself into the second block (without falling over) which then collides into the third block.

a. Assuming the final collision is elastic, and the third block has a final velocity of 5.00 m/s, what is the velocity of block 2 just before it collides into block 3?

b. What is the velocity of the bullet before it embeds itself into block 2?

c. Assuming the bullet slowed down by only 10% while it travelled through block 1, what was the speed of block 1 after the bullet traveled through it?

d. After all collisions, what percent of the initial energy of the bullet was lost?

Answer 1

AtPlyin onservao line moneuhum 2n blocle atn Since cot usion elasne, co ett, ofreon turion Velouy of appwach- velocihH separation 0) (2:025%) v @o25)(9rv) + S,'T w s 。 blocte 2 b) velec o bullet be vo before it embess into 2n acl t00o Cm c) &let Slowed douw, bao, aHan emerging at of block』 s vetocikj of bullut before evatesi-j lob 0% V (3D 2.13m/s uut se of block l, ^Hiv bullet avetouh, be

d) Before ad 2 2- KE1408.683 After all collisions Kinetic energy of bleek, is KE1 23че,239 Vinehc energ 2 So final letnehc enesy atter all colltsions is 14.2 J ullet lestEeE of b . d loss KE

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