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I have no idea what this means

What are the dimensions of viscosity η if the equation for the force on a sphere moving through liquid is F=6πηrv where r is the radius of the sphere, v is the speed and F is the force?

or this...

Show that the equation for the final velocity of an object undergoing uniform acceleration is dimensionally consistent.

v² = u²+2as

could someone help me out and explain what I need to do for these questions