m=2kg
h₁=40m
g≈10m/s²
h₂=30m
Epc₁=m·g·h₁
Epc₁=2kg·10m/s²·40m=800J
Epc₁=Em
Epc₂=m·g·h₂
Epc₂=2kg·10m/s²·30m=600J
Ek(30m)=Em-Epc₂
Ek=800J-600J=200J
Odp.: Energia kinetyczna wynosi 200J.
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m=2kg
h₁=40m
g≈10m/s²
h₂=30m
Epc₁=m·g·h₁
Epc₁=2kg·10m/s²·40m=800J
Epc₁=Em
Epc₂=m·g·h₂
Epc₂=2kg·10m/s²·30m=600J
Ek(30m)=Em-Epc₂
Ek=800J-600J=200J
Odp.: Energia kinetyczna wynosi 200J.