A 2.7-kg block is traveling in the x direction at 5 m/s, and a 1.1-kg block is t

Question

A 2.7-kg block is traveling in the x direction at 5 m/s, and a 1.1-kg block is traveling in the +x direction at 2.8 m/s.

(a) Find the velocity vcm of the center of mass. answer = -2.74

(b) Subtract vcm from the velocity of each block to find the velocity of each block in the center-of-mass reference frame. 2.7-kg block. Answer = -2.26

1.1-kg block.. answer = 5.54

Below are the questions I need help with.

(c) After they make a head-on elastic collision, the velocity of each block is reversed (in the center-of-mass frame). Find the velocity of each block in the center-of-mass frame after the collision. 2.7-kg block

(d) 1.1-kg block

(e) Transform back into the original frame by adding vcm to the velocity of each block. 2.7-kg block

(f) 1.1-kg block

Explanation / Answer

c)

since the velocity has reversed in center of mass reference frame

2.26 m/s

d)

- 5.54 m/s

e)

- 2.74 + 2.26 = - 0.48 m/s

f)

- 5.54-2.74 = - 8.28 m/s

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