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A stationary object explodes into two fragments. A 4.0 kg fragment moves westward at 3.0 m/s. What are the speed and kinetic energy of the remaining 2.0 kg fragment?

why can't i assume the kinect enegery of each object is the same?

I loked at it and assumed 1/2mv^2 for object 1 should equal object 2 subsituded numbers got 18J=1/2 2 v^2

but the answer says its 36J's

why can't i assume the kinect enegery of each object is the same?

I loked at it and assumed 1/2mv^2 for object 1 should equal object 2 subsituded numbers got 18J=1/2 2 v^2

but the answer says its 36J's

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