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v= 20m/s
Ek= 90 Joule
m=?
Ecuacion general
Ek= mv
Despejando m quedaria
m= √2Ek
v
Sustituyendo
m=√ (2)(90joule)
20m/s
Simplificando el 2 con el 20, quedaria
m=√90 joule
10m/s
m= √9 raiz de 9 es
m= 3 kg