Question

V0=0, delta t=4s( ultimile secunde). delta h=, 800m, g=10. h=?​

Answer 1

Răspuns:

Se da:

t=4s

d=800m

g=10m/s²

h=?m

Rezolvare:

Ec=Ep

mv²/2=mgh

h=v²/2g

v=v0+gt

d=v0t+(gt²/2)

v0t=d-(gt²/2)

v0=[d-(gt²/2)]/t

Calcule:

v0=[800-(10*4²/2)]/4=180m/s

v=180+10*4=220m/s

h=220²/2*10=2420m