Question

me ajudem Pfv, eu não tô entendendo nada ​

Answer 1

8.   v = 20 × √(273 + T)

a)   v = 20 × √(273 + 16) = 20 × √289 = 20 × 17 = 340m/s

b)   v = 20 × √(273 + 51) = 20 × √324 = 20 × 18 = 360m/s

c)   v = 20 × √(273 - 17) = 20 × √256 = 20 × 16 = 320m/s

9. t = √(h / 4,9)

a)   t = √(4,41 / 4,9) = √0,9 = 1s

b)   t = √(78,4 / 4,9) = √16 = 4s

c)   1,960 cm = 1,960 ÷ 100 m = 19,6m

     t = √(19,6 / 4,9) = √4 = 2s