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**conservation of mechanical energy ???**

i found this tricky since i would usually use something like v^2=u^2+2as but i dont have enough variables this time so I don’t even know which direction to go

a stone is thrown upwards with u=20m/s. use conservation of mechanical energy to find out how huigh it will go?

Oh I was told in a similar question earlier to take g as -10m/s^2 im not sure if I need this for this question

Thanks very much to anyone who take the time to help me