Question

Her hair/ hairs needs cutting

Answer 1

Answer:

hair

Explanation:

her hair needs cutting

hope this help you

Answer 2

Answer:

Her hair needs cutting.

Explanation:

I will give you a simple trick to find out.

1) When you find out that the noun or your object here is plural i.e. it ends with 's', then the verb won't have 's' at it's end.

2) And when the noun or your object isn't plural, it's singular i.e. it doesn't end with 's', then the verb will have 's' at the end.

For example:

1) Her hairs are silky.

  Here you can see that the noun is plural so the verb doesn't end with 's'.

2) The Earth revolves around the Sun.

   Here you can see that Earth is singular and so the verb ends with 's'.

So here in your question, The verb "needs" is ending with 's'.

Hence, your noun will be singular i.e. hair.

Hope it helps..