Răspuns :
- Răspuns:
v = 1.2 m/s
- Explicație:
Salut !
h = 0 cm
h₁ = 7.2 cm = 0.072m
Ep = Ec
mₓgₓh₁ = mₓv²/2
2mₓgₓh₁ = mv²
v² = 2mₓgₓh₁/m
v² = 2gₓh₁
v² = 2ₓ10m/s²ₓ7.2cm
v² = 20m/s²ₓ0.072m
v² = 1.44m²/s²
v = 1.2 m/s
v = 1.2 m/s
Salut !
h = 0 cm
h₁ = 7.2 cm = 0.072m
Ep = Ec
mₓgₓh₁ = mₓv²/2
2mₓgₓh₁ = mv²
v² = 2mₓgₓh₁/m
v² = 2gₓh₁
v² = 2ₓ10m/s²ₓ7.2cm
v² = 20m/s²ₓ0.072m
v² = 1.44m²/s²
v = 1.2 m/s