Question

In the past, different units were used to measure
the length, mass and time in different countries.
These were the following three systems of units:
1. Centimetre-gram-second (C.G.S.) system
2. Foot-pound-second(F.P.S.) system, and
3. Metre kilogram-second (M.K.S.) system.​

Answer 1

Answer:

Centimetre-gram-second(C.G.S) system.

Answer 2

Answer: 2& 3

Explanation: FPS and MKS were uded in the past but nowadays only CGS system is used!

Hope this helps!