a) What is the net force acting on an object with a mass of 10 kilograms, falling at a constant downward velocity of 15 meters per second (15 m/s)?

a) What is the net force acting on an object with a mass of 10 kilograms, falling at a constant downward velocity of 15 meters per second (15 m/s)?Please show work. 

b) What is the net force acting on an object with a mass of 10 kilograms, falling with a downward acceleration of 15 meters per second squared (15 m/s2)? Please show work. 

A material has a mass of 45 grams and a volume of 40 milliliters. What is the material’s density? Would the material sink or float in water at a temperature of 20 degrees Celsius? Explain.

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