Question

a piece of metal weighs 75N in air and 60 N in water what is the buoyant force acting on the metal?

Answer 1

$$W _ {a i r} = m g = 7 5 N$$ $$W _ {w a t e r} = m g - F _ {B} = 6 0 N$$ $$F _ {B} = W _ {a i r} - W _ {w a t e r} = 7 5 N - 6 0 N = 1 5 N$$