試題詳解

2. Two masses m₁ and m₂ placed on a flat surface are connected by a spring of a spring constant k aligning in the x direction; see figure below. Initially, the spring is at its natural length (no compression/extension), and m₁ is at rest while m₂ moves with a velocity in the +x direction. Since there is friction, these masses will eventually stop moving. Assume these two masses are identical, m₁ = m₂ = m, and the gravitational strength is g. What is the minimum friction coefficient required so that m₁ never moves during the slowdown motion of m₂? For simplicity, assume the kinetic and static friction coefficients are the same.

(A)
(B)
(C)
(D)

(E) None of the above