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Question

A body weighs 50 N in air and it weighs 40 N when immersed in water. Find out the force of buoyancy acting on the body in water.

A
10 N, upward direction
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B
90 N, upward direction
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C
10 N, downward direction
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D
90 N, downward direction
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Solution

The correct option is A 10 N, upward direction
Given:
Weight of body in air (w1) = 50 N
Weight of body when immersed in water (w2) = 40 N

We know that, buoyant force (FB) always acts on the body in the upward direction, and the value of buoyant force is equal to loss in weight of the immersed body in water (w).
w=FB=w1w2
FB=5040
FB=10 N

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