If a textbook weighs 19.6 newtons on venus what is the acceleration of gravity on venus

We can't tell from the information in the question.

Weight = (mass) x (acceleration of gravity).

In order to find any of those quantities, we need to know
the other TWO things.

We can't answer the question until we know either the mass
of the book, or its weight on some other planet other than Venus.

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