We even need to state the assumption made in part 1,
Please help with this one

Dear student

We have,

Weight of the body in air, W = 450 gf = 450g dynes

Weight of the body in water, W^/ = 310 gf = 310g dynes

Let, d be the density of the body, V be its volume. Let q be the density of water.

Now,

W = Vdg

=> 450g = Vdg

Buoyant force, B = Vqg

=> B = Vg  [q = 1 g/cm³]

Now, W^/ = W – B

=> 310g = 450g – Vg

=> V = 140 cm³

Loss in weight = Buoyant force = Vqg = 140 × 1 × g = 140g dynes = 140 gf

Again, upthrust = Buoyant force = 140 gf


With regards