What is the acceleration on planet X, if a 1.5 kg object weighs 3.45 N on plantet X?

Answer 1

Labeling the School Subjct "llth grade" may not get the teacher you need to read your post.

Sra

Answer 2

Newton's Second Law:
F(or weight) = mass x acceleration.

so, a = F/mass = 3.45/1.5

You do the math and don't forget the units!

Answer 3

2.3