Is it possible for an object to have a constant speed but be accelerating?

Yes.  'Acceleration' does NOT mean speeding up.

Acceleration means any change in the speed or direction of motion.
Speeding up, slowing down, or rounding a curve are all accelerations.

Any object that's not moving in a straight line is accelerating, even if
its speed is constant.  

-- Your car is accelerating when you drive 30 mph along a curved road.

-- You're accelerating on a merry-go-round (carousel) or a ferris wheel
when it's speeding up, slowing down, or turning at a constant rate.

-- Your car is accelerating when you see a red light and step on the brakes.

-- You are accelerating when you jog around a circular track at gym.

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.