Question

Forward I am heavy, but backward I am not. What am I?

Answer 1

Ton. Ton is the answer.

Answer 2

Answer :

Ton

Explanation :

Question mentions the forward the thing is "heavy", but backward it is "not".

Ton is a unit if measurement related to mass (weight). Ton is used to measure very heavy items. As 1 ton is equal to 1000 kilograms.

"Forward" in the question means to read "Ton" from left to right.

Backward means to read it Right to left.

==> T O N = N O T

So, Ton is heavy from forward but not from backwards.

Therefore the answer is $\bf{TON}$