What is the standard unit of the spring constant (stiffness) of a spring?
N\text{N}N
N m\text{N\,m}Nm
N/m\text{N/m}N/m
N/m2\text{N/m}^2N/m2
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.