The three basic dimensions of mechanics are length, mass, and time. The SI unit of length is the meter (m), the SI unit of mass is the kilogram (kg), and the SI unit of time is the second (s).
Other related questions:
Q: What SI unit is used for dimensions?
A: The SI unit for dimensions is the meter.
Q: What are the basic dimensions used in mechanics?
A: There are four basic dimensions in mechanics: length, mass, time, and temperature.
Q: What are the three basic dimensions in physics?
A: The three basic dimensions in physics are length, width, and height.
Q: How are SI units used in mechanical engineering?
A: The SI units most commonly used in mechanical engineering are the metre (m), kilogram (kg), second (s), and Newton (N).