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Weight on Earth:
A: Weight = mass x acceleration due to gravity = 12kg x 10N/kg = 120N
B: Weight = mass x acceleration due to gravity = 0.5kg x 10N/kg = 5N
C: Weight = mass x acceleration due to gravity = 0.02kg x 10N/kg = 0.2N
Weight on Mars:
A: Weight = mass x acceleration due to gravity = 12kg x 3.8N/kg = 45.6N
B: Weight = mass x acceleration due to gravity = 0.5kg x 3.8N/kg = 1.9N
C: Weight = mass x acceleration due to gravity = 0.02kg x 3.8N/kg = 0.076N