9. (10 points) When a body is accelerated under water, some of the surrounding water is also accelerated. This makes the body appear to have a larger mass than it

actually has. For a sphere at rest this added mass is equal to the mass of one half of the displaced water. Calculate the force necessary to accelerate a 10 kg, 300-mm-diameter sphere which is at rest under water at the acceleration rate of 10m/s? in the horizontal direction. Use H20 = 1000 kg/m.