Answer:
weight of the rock on Uranus is 218 Newton.
Step-by-step explanation:
Weight of the object is given by,
Weight = mass × gravitational acceleration
For Uranus,
gravitational acceleration = 8.7

thus,
Weight of rock on Uranus is,
Weight = mass × gravitational acceleration
Weight = 25 × 8.7
Weight = 217.5 Newton
Thus, weight of the rock on Uranus is 218 Newton.