Need help solving these questions. No points rewarded if no explaination A solid

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Need help solving these questions. No points rewarded if no explaination

A solid ball dropped in a lake sinks through the water. As it is sinking toward the bottom, the buoyant force on the ball... is greater than the weight of the ball and directed upward is less than the weight of the ball and directed upward is equal to the weight of the ball is greater than the weight of the ball and directed downward is less than the weight of the ball and directed downward Refer to the previous question. The volume of the ball is 2.0 times 10-4 m3. When placed in the water it has an initial velocity of zero. As it sinks, it drops a vertical distance of 15 m in 5.0 seconds. What is the mass of the ball? Treat water as an ideal fluid. 0.78 kg 0.45 kg 0.38 kg 0.23 kg 0.12 kg

Explanation / Answer

12- it is less than the actual weight of the ball and is directed upwards

13- acceleration=2h/t^2

=2*15/25

=1.2 m/s^2

so,

mg-rho*v*g=ma

or m*9.8-2*10^-4*1000*9.8=m*1.2

or m=0.2279 kj

so, m=0.23 kg

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