Respostas

2013-04-24T22:48:17-03:00

a)-25=10-5.t

    -5t=-35 . (-1)

     5t=35, logo t=35 / 5 --------> t=7 s

 

b)S=0

    0=10-5t

    -5t=-10 . (-1)

    t=10 / 5, logo t=2 s