The unit of gravitational field strength, N/kg\text{N/kg}N/kg, is equivalent to which of the following units of acceleration?
m/s\text{m/s}m/s
m/s2\text{m/s}^2m/s2
kg/N\text{kg/N}kg/N
kg⋅m/s2\text{kg}\cdot\text{m/s}^2kg⋅m/s2