What is the unit of the spring constant (stiffness) of a spring?
N\text{N}N
N/kg\text{N/kg}N/kg
N/m\text{N/m}N/m
N m\text{N m}N m
183 exam-style questions on CIE IGCSE Physics 1.5.1a Forces, resultant force and motion. Each one has a worked solution and a mark scheme showing where the marks go.