Can upthrust be greater than the weight of the body?

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Solution

When an object floats, the weight of the body is equal to the upthrust.
When an external force is applied to the body, the upthrust acting on the body increases and will now be more than the actual weight of the object.
If the upthrust is larger than the weight of the object, the object will rise.
This happens when you jump into a swimming pool and then rise back up to the surface. Under the surface, the weight of water you displace - the upthrust - is more than your weight, so there is a resultant upwards force.

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