The force the Earth exerts on the boy is his weight. We can calculate this using the formula:

Weight = Mass x Acceleration due to gravity

* Mass (m): 50 kg

* Acceleration due to gravity (g): 9.8 m/s² (approximately)

Weight = 50 kg x 9.8 m/s² = 490 N

Therefore, the Earth exerts a force of approximately 490 Newtons on the boy.