Answer :
The other force that must be acting on the duck is upthrust of 10 N.
The given parameters;
- weight of the rubber duck, W = 10 N
When the weight of the object is equal to the upthrust, the apparent weight will be zero and the object will float in the liquid. This is known as principle of floatation.
Since the given weight of the rubber duck is 10 N, then the upthrust on the duck will be 10 N to enable the duck float on the water.
Thus, the other force acting on the duck is upthrust of 10 N.
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