To calculate the weight of a 10.0 kg object in newtons, we use the formula:

Weight (in newtons) = mass (in kilograms) × acceleration due to gravity

The acceleration due to gravity on Earth is approximately 9.8 m/s², so we can plug in the values:

Weight = 10.0 kg × 9.8 m/s²

Weight = 98 N

Therefore, a 10.0 kg object has a weight of 98 newtons on Earth.