\"two objects X and Y are held at rest on a horizontalfrictionless surface. a sp

Question

"two objects X and Y are held at rest on a horizontalfrictionless surface. a spring is compressed between X andY. the mass of X is 2/5 times the mass of Y. when theobjects are released, the ratio of the kinetic energy of X to thatof Y is: " THank you ! "two objects X and Y are held at rest on a horizontalfrictionless surface. a spring is compressed between X andY. the mass of X is 2/5 times the mass of Y. when theobjects are released, the ratio of the kinetic energy of X to thatof Y is: " THank you !

Explanation / Answer

mass of object X = 2my / 5 mass of object Y = my          KE of X / KE ofY   = 0.5 (2my / 5) v2 / 0.5* myv2                                         = 2 / 5

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