m = 200 g = 0,2 kg
v₀ = 30 m/s
h = 20 m
v² = v₀² + 2as
v² = 30² + 2 . (-10) . 20
v² = 900 - 400
v² = 500
v = 10√5
Ek = 1/2 . m . v²
Ek = 1/2 . 0,2 . (10√5)²
Ek = 1/2 . 0,2 . 500
Ek = 50 J
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m = 200 g = 0,2 kg
v₀ = 30 m/s
h = 20 m
v² = v₀² + 2as
v² = 30² + 2 . (-10) . 20
v² = 900 - 400
v² = 500
v = 10√5
Ek = 1/2 . m . v²
Ek = 1/2 . 0,2 . (10√5)²
Ek = 1/2 . 0,2 . 500
Ek = 50 J