Question

Un sportiv cade liber de la h=3000 m (fara viteza initiala).
Sa se calculeze:
-legea vitezei;
-legea de miscare;
-timpul de cadere;
-viteza la sol.

Answer 1

v(t)=v₀+gt =0+10t=10t (m/s)

v(t)=10t (m/s)

x(t)=v₀t+gt²/2=0+10t²/2=5t² (m)

x(t)=5t² (m)

h=v₀t+gt²/2<=>3000=0+5t²<=>600=t²=>t=√600=24,49 s

t=24,49 s

v²=v₀²+2gh=0²+2*10*3000=60000=>v=√60000=244,94 m/s

v=244,94 m/s