Answer :

Explanation:

9.80665 N/kg is the force applied by Earth's gravity on a 1 kg of mass (that is then the weight of 1kg mass). the acceleration due to this gravity is usually correspondingly defined as 9.81m/s².

now we have 99 kg.

that means we have to multiply 9.81 by 99

99×9.81 = 971.19 N

if we just roughly round the weight of 1 kg from 9.81 to 10 N, we get then the proposed 99×10 = 990 N result.

but as you can see, this is not very precise.

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Rewritten by : Barada