1. W= F x s= m x g x ( h1 - h2) = 2,5 kg x 10 m/s2 x ( 2 - 0,7)m= 32,5 J
2. W = m x a x s= m x Δv/t x v x t= m x v2= 1000 kg x ( 30 m/s)2= 900 000 J
3. Ep = m x g x h --------------m = Ep/ g x h = 285 J/ ( 10m x 10 m/s2) = 2,85 kg
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1. W= F x s= m x g x ( h1 - h2) = 2,5 kg x 10 m/s2 x ( 2 - 0,7)m= 32,5 J
2. W = m x a x s= m x Δv/t x v x t= m x v2= 1000 kg x ( 30 m/s)2= 900 000 J
3. Ep = m x g x h --------------m = Ep/ g x h = 285 J/ ( 10m x 10 m/s2) = 2,85 kg