Answer:
O N
Explanation:
Upthrust = Volume of object * density of fluid * acceleration due to gravity
Upthrust = 4.0 m3 * 1000 kg/m3 * 10 m/^2
Upthrust = 40, 000 N
Upthrust = Weight in air - Weight in water
Weight in air = 40,000 N
Weight in water = Weight in air - Upthrust
Weight in water = 40,000 N - 40,000 N
Weight in water = 0 N
