Răspuns:
a)
v² = v₀² - 2gh
v = 0m/s
0 = v₀² - 2gh
2gh = v₀²
h = v₀²/2g = (16m²/s²)/(2ₓ10m/s²) = 0.8 m
b)
Ep = mgh = 0.1kg×10N/kg×0.8m = 0.8 J
c)
v² = v₀² - 2g(h/2)
= 16m²/s² - 2×10m/s²×0.4m
= 16m²/s² - 8m²/s²
= 8m²/s²
v ≈ 2.8 m/s
d)
Ec = mv²/2
= 0.1kg×(2.8 m/s)²/2
= 0.392 J