Question

un autoturism isi mărește viteza v1=54 km/h la v2 = 72 km/h in intervalul de timp delta t =10 s . Ce acceleratie are automobilul daca se mișca rectiliniu ?

Answer 1

Salut,

$a=\dfrac{v_2-v_1}{t}=\dfrac{72-54\;km/h}{10\;s}=\dfrac{18\;km/h}{10\;s}=\dfrac{18\cdot\dfrac{1000\;m}{3600\;s}}{10\;s}=\\\\=\dfrac{\dfrac{18}{3.6}\;m/s}{10\;s}=\dfrac{18}{36}\;m/s^2=0.5\;m/s^2.$

Green eyes.