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= 375.000 J : ( 1/2 × ( 72 km/jam × 10/36 )² m/s )
= 375.000 J : ( 1/2 × 20² m/s )
= 1.875 kg
Ek=375 kj=375000 J
m=..?
Ek=1/2.m.v^2
375000=1/2.m.20^2
375000=1/2.400.m
375000=200.m
m=375000/200
m=1875 kg