Question

RESPONDAM COM AS FORMULAS OBGDA

Answer 1

1) $a = \frac{v}{t}$
Para descobrir o v é necessário utilizar $v = \frac{s}{t} ; v= \frac{100}{5}; v=20$ 
$a = \frac{20}{5} \\ a=4m/ s^{2}$

2) 100 km/h ÷ 3,6 = 27,8m/s 
$a = \frac{27,8}{200} \\ a=0,139m/ s^{2}$

3) V0 = 2m/s S = 8m Vf = 6m/s t = S/ΔV
$a = \frac{6-2}{2} \\ a=2$

5) V = S/t ⇒ V = 20/10 ⇒2m/s

6) V = S/t ⇒ V = 1600/240 ⇒ V = 6,7m/s (1min --- 60s → 4min --- 240s)

7) V = S/t ⇒ V = 200/10 ⇒ V = 20m/s

8) a = v/t ⇒ a = 20/5 ⇒ a = 4m/s²

9) a = v/t ⇒ 10 = 25/t ⇒ t = 25/10 ⇒ t = 2,5s (90km/h÷3,6 = 25m/s)

12) c. S = 10 + 2t 
         S = 10 + 2(6)
         S = 10 + 12 ⇒ S = 22m