Doubt from conservation of energy


2.2 m/s given answer

Sending solution there might be some calculation error. I have done this question in past.

Yes I had some calculation answer answer is coming 2.2ms(-1)

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Ok I got it
I confused in getting h .
It is right triangle.

I have its solution
I m not able to understand method used in 1st image
Anyone help @Bhuvanitha_2020
@Amritaansh_2020 @Samarth_2020

Do you have ans of these two....I did by another method

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No I don't have its answers