Motion problem -- Calculations given the v(t) graph of a person jumping

[shk]

Homework Statement

I need someone to check my working for this question please.

Relevant Equations

a=v/t

Hi
I have answered the question and have attached my working .
I'm not very sure about part b. I generally need someone to check my working and let me know if I've made a mistake.
Thanks

 

[haruspex]

Looks good. Since it is on graph paper, they might want you to do some square counting, but unlikely.

 

[Marso]

Everything seems in order!

 

[shk]

Looks good. Since it is on graph paper, they might want you to do some square counting, but unlikely.

Thanks for the comment

 

[shk]

Everything seems in order!

Thank you very much