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## Homework Statement

A 160 g ball attached to a spring with spring constant 2.8 N/m oscillates horizontally on a frictionless table. Its velocity is 20 cm/s when x_0 = 4.5 cm.

a_max = _______ cm/s^2

**2. The attempt at a solution**

Using F = ma and F = kx

kx = ma

a = kx/m

Substituting the appropriate values

a = (2.8)(4.5)/(.16) = 78.75 cm/s^2

Am I missing something here?