im studying for my grade 10 final exam and ive lost my basic formulas note. could someone please post the formulas to find 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.