[[1]] is the force acting on an object perpendicular to the surface.

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Detailed Solution

Upthrust is the force acting on an object perpendicular to the surface.
Upthrust is a force that works in an upward direction perpendicular to the surface. This force is also called the force of buoyancy. This phenomenon of experiencing an upward force by an object when immersed in a fluid is called buoyancy.

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