# The kinetic energy of an object with a mass of #4 kg# constantly changes from #30 J# to #390 J# over #9 s#. What is the impulse on the object at #2 s#?

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The impulse on the object at 2 s is 40 Ns.

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- A ball with a mass of #6 kg# moving at #3 m/s# hits a still ball with a mass of #8 kg#. If the first ball stops moving, how fast is the second ball moving?
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