Final answer:
The apparent weight of the body placed in water would be 40 g.
Step-by-step explanation:
The apparent weight of a body placed in water can be calculated by subtracting the upthrust force from the true weight of the body. In this case, the body has a true weight of 50 g and experiences an upthrust of 10 g. So the apparent weight of the body in water would be 50 g - 10 g = 40 g.