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Usaha = F x a
= (kg)(m/s2) x (m)
jadi terdiri dr besaran pokok massa (kg), panjang (m), waktu (s)
Energi = J
= 1/2 × massa × (kecepatan)²
jadi terdiri dr besaran pokok massa (kg) dan waktu (s), serta panjang (m)