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In the first stage of a two-stage rocket...

In the first stage of a two-stage rocket, the rocket is fired from the launch pad starting from rest but with a constant acceleration of `4.0 m//s^(2)` upward. At 10.0 s after launch, the rocket fires the second stage, which suddenly boosts its speed to 100.0 m/s upward. This firing uses up all the fuel, how-ever, so then the only force acting on the rocket is gravity `(10 m//s^(2))`. Air resistance is negligible.
Time(s) during which its motion is under gravitational acceleration (only)

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The correct Answer is:
`7.00`
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