IIT-JEE Exam

The density of a substance is 8 g/cm3. Now
we have a new system in which unit of length
is 5cm and unit of mass 20g. Find the density
in this new system

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IIT-JEE Other Question

If the units of force, energy and velocity in a
new system be 10 N, 5J and 0.5 ms–1
respectively, find the units of mass, length
and time in that system To derive the Einstein mass - energy relation