Jornal de Física (r ) ! #$ & ! ! " ! %% (∆r ) ' ( r fin − rin & ∆r " ) ' * + ) , /. * 0 *! * . ) ! " * ) 1 / ! (vm ) vm = ∆r ∆t . rin 0 ∆r ≤ ∆S ∆t . r fin * . - * * ∆r * ∆r ∆t . 2/ (am ) & am = * ! ∆v ∆t am 3 / ∆v & ! 2 ) * 1 . 5 7 * + 4 * & 1 8% 9 1 + :; * *) ( * 4 6 * ! ( ! *2 * / (/ & - !* ! : & :* !* < * 4 * * * ' ) ;1 = + ( 3 8% 9 1 + + + / 1 * ! 4 > / ! + ! 1 & a R = at + acp a R2 = at2 + acp2 * 5 * > /