A 42-Kg Object,initially at Rest,"explodes" into Three Objects of Equal Mass

question 8

Multiple Choice

A 4.2-kg object,initially at rest,"explodes" into three objects of equal mass.Two of these are determined to have velocities of equal magnitudes (5.0 m/s) with directions that differ by 90 $\degree$ .How much kinetic energy was released in the explosion?

• A)70 J
• B)53 J
• C)60 J
• D)64 J
• E)35 J

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