Question

urgentt va rog!! cum se revolva??

Answer 1

t∈{7;8} s

d1=at1²/2=7²a/2=24,5a

d2=at2²/2=8²a/2=32a

d=d2-d1=7,5a

30=7,5a=>a=30/7,5=4 m/s²

t1∈{0,1)

d1'=at1'²/2=0²*4/2=0

d2'=at2²/2=1²*4/2=2

d'=d2'-d1'=2-0=2 m