Final answer:
The weight of the stone is 4500 Newtons.
Step-by-step explanation:
The weight of a stone with a mass of 450 kg in a gravitational field strength of 10 N/kg can be calculated using the formula weight = mass x gravitational field strength (w = mg).
So, the weight of the stone would be 450 kg x 10 N/kg = 4500 N.
Therefore, the weight of the stone is 4500 Newtons.