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Ec = ½ m v²
27 = (½) m (3²)
27 = (9/2) m
54/9 = m
m = 6
El valor de la masa es de 6kg
2) m = 4 kg Ec = 1250 J
Ec = (½)mv²
1250 = (½)(4)v²
v² = 1250/2
v² = 625
v = 25
la Velocidad del proyectil es de 25 m/s
3) m = 2kg Ec = 81 J
Ec = (½)mv²
81 = (½)(2)v²
v² = 81
v = 9
La pelota viaja a 9 m/s de velocidad
4) v = 2 m/s Ec = 32 J
Ec = (½)mv²
32 = (½)m(2²)
32 = 2m
m = 16
La masa del perro es de 16 kg