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Los datos que tienes son:
m = 1 ton
v = 50 km/h
Ec = ?
Pasas las unidades al SI
v = (50 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 13,89 m/s
1 ton (1000 kg ) / 1 ton
1 (1000 kg) / 1
1000 kg / 1
1000 kg
Calculamos la energía cinética.
Ec = 1/2 (m) (v)²
Ec = 1/2 (1000 kg) (13,89 m/s)²
Ec = 500 kg (192,93 m²/s²)
Ec = 96465 Joules-----------Respuesta