Question

1. what are the si base units for length and mass?

meter and kilogram
kilometer and gram
kilometer and kilogram
meter and gram

Explanation:

The International System of Units (SI) has defined base units. For length, the base unit is the meter. For mass, the base unit is the kilogram. A kilometer is a derived unit (1000 meters) and a gram is a sub - unit (0.001 kilograms).

Answer:

meter and kilogram