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m = 200 gr
v = 25 m/s
Ec = ?
Pasas los gramos a kilogramos
1 gr----------------0,001 kg
200 gr-------------x kg
x = (200 gr * 0,001 kg) / 1 gr
x = 0,2 kg / 1
x = 0,2 kg
Calculamos energía cinética.
Ec = 1/2 (m) (v)²
Ec = 1/2 (0,2 kg) (25 m/s)²
Ec = 0,1 kg (625 m²/s²)
Ec = 62,5 Joules--------Respuesta
saludos desde venezuela