Question

1000gm unit of mass,60 sec unit of time,acceleration of gravity 981 cm/ sec²,what could be the unit of energy in erg

Answer 1

Choosing three base units fixes all derived units. If the unit of mass is a kg, the unit of time a minute and the unit of acceleration a decameter per second squared, then the unit of energy (mass times acceleration) is kg decameter per second squared.

Note that under this choice of units length (acceleration times duration squared) would be measured in decameter per second squared times minute squared. This length unit equals 10 decameter times 60 squared, or 36 km.