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Los datos que tienes son:
m = 8 gr
v = 400 m/s
Ec = ?
Pasas los gramos a kilogramos
8 gr (0,001 kg) / 1 gr
8 (0,001 kg) / 1
0,008 kg / 1
0,008 kg
Calculamos la energía cinética.
Ec = 1/2 (m) (v)²
Ec = 1/2 (0,008 kg) (400 m/s²)
Ec = 0,004 kg (160000 m/s²)
Ec = 640 Joules
Respuesta.
Ec = 640 Joules