A body of mass 3.5 kg displaces 1000 cm³ of water when fully immersed inside it. Calculate (i) the volume of body, (ii) the upthrust on body and (iii) the apparent weight of body in water.

Therefore, weight = 3.5 kgf

Volume of displaced water = 1000 cm³

(i) Volume of body = volume of the water displaced = 1000 cm³

Hence, the volume of body = 1000 cm³

(ii) Upthrust on body = volume of the body × density of water × g

= 1000 × 0.001 × g = 1 kgf

(iii) The apparent weight of body in water = true weight – upthrust

= 3.5 – 1

= 2.5 kgf