Question

a body of mass 70kg. when completely immersed in water displaces, 2000cm cube.what is the relative density of the material of the body

Answer 1

volume= 2000 cm3
or 2000 x 10⁻⁶ m₃ or 2 x 10⁻³ m₃

density= 70 kg / 2 x 10 ⁻³
= 5 x 10 ³

relative denisty= denisty of substance/ water density 
= 35 x 10³ / 10³
=35

Answer 2

┏─━─━─━─━∞◆∞━─━─━─━─┓
✭✮ӇЄƦЄ ƖƧ ƳƠƲƦ ƛƝƧƜЄƦ✭✮
┗─━─━─━─━∞◆∞━─━─━─━─┛

➧ Volume = 2000 cm³

➾ 2000 x 10-⁶ m³

➾ 2 x 10³ x 10-⁶ m³

➾ 2 x 10-³ m³

➧ So, density of the substance
➾ 70 kg/ 2 x 10-³ m³

➾ 35 x 10³ kg/m³

➧ Relative density =  density of substance / density of water

➾ 35 x 10³ / 10³
➾ 35 ...✔

_________
Thanks...✊