Question

w prostoliniowej prowadnicy toczy sie kulka ze stałą predkoscia 3 m/s jak dlugo bedzie sie toczyc sie kulka jesli prowadnica ma12 m długosci.

Z miejsca rusza pojazd z przyspieszeniem4,5 m/s kwadrat,jaką szybkosc osiagnie pojazd po 10 s i jaka w tym czasie przebedzie odległosć.Wskazówka:przyjmujemy ze ruch pojazdów jest prostoliniowy

Answer 1

1 Dane:                                                                                            Szukane:

 v = 3m/s                                                                                            t = ?

 s = 12m

 

                                        

                                                V = s/t |∙t

                                            V ∙ t = s | : v

                                                 t = s/v

                                                 t = 12m / 3m/s

                                                 t = 4 s

 

2. Dane:                                                                                             Szukane:

   a = 4,5 m/s^(2)                                                                                       V= ?

   t= 10s                                                                                                     s = ?

                                                     ∆V = a ∙∆t

                                                     ∆V = 4,5m/s^(2) ∙ 10 s

                                                    ∆V = 45m/s

 

                                                     s = at^(2)/2

                                                     s = 4,5m/s^(2) ∙ 10s^(2)/2

                                                     s = 225 m