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Los datos que tienes son:
m = 20 kg
v = 40 m/s
Ec = ?
Calculamos la energía cinética del carrito.
Ec = 1/2 (m) (v)²
Ec = 1/2 (20 kg) (40 m/s)²
Ec = 10 kg (1600 m²/s²)
Ec = 16.000 Joules
Respuesta.
Ec = 16.000 Joules