Question

A body has a weight 50 N in air. After immersing completely in liquid its weight is 20 N. Then the buoyant force on the body will be

Answer 1

Actual weight of the body = 50N

and
when immeresed in water it's Boyant force + new weight = It's actual weight

Since, the new weight is 20N

Therefore,
the boyant force = 50N - 20N

Hence, the boyant force on the body will be 30N.

Answer 2

Hey!

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We have,

Weight in air = 50 N
Weight in water = 20 N
Buoyant force applied = ?

We know,

Buoyant force + New weight = Actual weight

So, We have new weight = 20 N and actual weight = 50 N

Buoyant force + 20 = 50 N
Buoyant force = 50-20
Buoyant force = 30 N

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Hope it helps...!!!