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examhelp!

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speed

time

displacement

acceleration

distance ( maybe)

( i think its in relation to distance and time and speed)

also in my review sheet there is this question

a ;arge boulder is positioned precariously on a ledge. The boulder is disturbed and falls into the river below under the force of gravity with an acceleration of 9.81 m/s (squared)

a) how high up was the ledge?

which formula would i use to solve that? thanks in advance.