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m=4kg
v= 20m/s
dit: berapa besar energi?
penyelesaian:
= 1/2xmxv^2
= 1/2x4x(20x20)
=2 x 400 = 800 joule(J)
=½ . 4 kg . (20²)m/s
=2 . 400
=800 joule