Question

plz answer to be the brainliest

Answer 1

density of water =1000kg/m^3
Here,
density of body = 600kg/m^3
mass of body =120kg
so ,volume of body=
mass/density=120/600=1/5m^3

to just sink body in water density must be just
more than density of water i.e.>1000kg/m^3

for a)20kg
density of body=m/V=(120+20)/(1/5)=140×5=700kg/m^3 {< 1000kg/m^3}
so it will float on water
FOR b)80kg density=(120+80)/(1/5)=1000kg/ m^3 = density of water

it stay as it where it is.
c)100kg
density=220/0.2=1100kg/m^3
just more than water so it will just sink.
d)120kg
density=240/.2=1200kg/m^3
more than water so it will completely sink.

so answer is c)100kg