\"Relative\" is an important word. In the figure below, block L of mass m_L = 2.

Question

"Relative" is an important word. In the figure below, block L of mass m_L = 2.00 kg and block R of mass m_R = 0.500 kg are held in place with a compressed spring between them. When the blocks are released, the spring sends them sliding across a frictionless floor. (The spring has negligible mass and falls to the floor after the blocks leave it.) If the spring gives block L a release speed of 1.40 m/s relative to the floor, how far does block R travel in the next 0.800 s? m If, instead, the spring gives block L a release speed of 1.40 m/s relative to the velocity that the spring gives block R, how far does block R travel in the next 0.800 s? m

Explanation / Answer

mL * v = mR * V0

2 * 1.4 = 0.500 * V0

V0 = 5.6 m/s

R travels in next 0.800 sec

= 5.6 * 0.800

= 4.48 m

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