Any two differences between SI units and derived units
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SI unit

1) SI unit does not depend on other.

2) they have their own identity.

Derived unit

1) They depend upon other or fundamental unit.

2) they don't have their own identity.

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.