A 7.0\, \text {kg}7.0kg7, point, 0, start text, k, g, end text box is at rest on a table. The static friction coefficient \mu_sμ s ​ mu, start subscript, s, end subscript between the box and table is 0.400.400, point, 40, and the kinetic friction coefficient \mu_kμ k ​ mu, start subscript, k, end subscript is 0.100.100, point, 10. Then, a 30\,\text N30N30, start text, N, end text horizontal force is applied to the box. What is the best estimate of the magnitude of the box’s acceleration?