Question

Why here gravitation is 10 instead of 9.8?

Answer 1

here gravitational force is supposed as 10

Answer 2

The accurate value of g is actually 9.8m/s²
But in some cases 9.8 is rounded off to 10 for the convenience to do the problem or to get an accurate answer.
But keep in mind that ,use 10m/s² as g only if it is asked so ,in question.