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During its vertical launch, a 4 kg model rocket speeds up from 0 to 80
m
s
in 3 seconds. What is the total energy gain (kinetic and potential) of the rocket during the three seconds?

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Problem by allie

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A 2 million kg rocket launches from ground level, with an angle of inclination of 45 degrees. Its speed after launch is 1414
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B.  How much potential energy does it have? 
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