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m=10kg
v=20m/s
Ek=mv²/2
Ek=10*20²/2 = 5*400=2000 (J)
V = 20 m/s
Ek = ?
E k = 1/2* m* v^2
Ek = 1/2 *10 kg * 400 m^2/s^2
Ek = 2000 J = 2 kJ