First slide
Fluid statics
Question

A ball of relative density 0.8 falls into water from a height of 2m. The depth to which the ball will sink (neglect viscus force)

Moderate
Solution

Velocity with which it hits the water surface   2g.2m/s
Net force inside mg-vd1g.
 F=mgmdldsgF=mg110.8=mg4 
So it moves down with retardation g/4.
Stopping distance  v22a

=2.g22.g/4=8m

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