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= 1/2 5 x 72 pangkat dua
= 1/2 5 x 5184
= 1/2 x 25.920
= 1.7960
caranya = 1/2 x m x v²
= 1/2 x 5000 x 20²
= 1/2 x 5000 x 400
= 1.000.000
Nb: kecepatannya dijadikan m/s jadinya 72000/3600 = 20
massanya jadikan kg