sebuah roket model bermassa 10 kg memiliki energi kinetik 12.500 J. hitunglah kelajuan roket itu.
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D2)v=?
D3) Ek = 1/2.m.v2
12.500= 1/2.10.v2
12.500= 5.v2
5.v2 = 12.500
v2 = 12.500/5
v2= 2500
v = √2500
v = 50