Gravitational forces ("weight") = (mass) x (acceleration of gravity)
On Earth's surface, acceleration of gravity = 9.8 m/s²
Weight of the object on Earth = (0.250 kg) x (9.8 m/s²)
= 2.45 newtons
Weight of Earth on the object = (0.250 kg) x (9.8 m/s²)
= 2.45 newtons
(about 8.81 ounces)