A rock of density 2500kg/m^3 with volume 0.002m^3 falls from rest in a viscous medium. The rock is acted on by a net constant downward force of 30N (combination of gravitational and buoyant force Fb) and a viscous retarding force Fd, proportional to it’s velocity, v:Fd= 5v i) Draw a free body diagram showing forces acting on the rock ii) Explain what is meant by ‘viscous medium’ iii) Calculate the mass of the body iv) Calculate initial acceleration of body v) Calculate the terminal velocity of the rock (iii,iv,v)

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A rock of density 2500kg/m^3 with volume 0.002m^3 falls from rest in a viscous medium. The rock is acted on by a net constant downward force of 30N (combination of gravitational and buoyant force Fb) and a viscous retarding force Fd, proportional to it’s velocity, v:Fd= 5v i) Draw a free body diagram showing forces acting on the rock ii) Explain what is meant by ‘viscous medium’ iii) Calculate the mass of the body iv) Calculate initial acceleration of body v) Calculate the terminal velocity of the rock (iii,iv,v)

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