3. A model rocket is launched straight upward at 58.8 m/s. a. How long does it take for the rocket to reach its peak height?

Let us assume that rocket only runs in initial energy and not using its own to flying.

Also , let upward direction is +ve and downward direction is -ve .

Initial velocity , u = 58.8 m/s .

Acceleration due to gravity , .

Final velocity , v - = 0 m/s .

We know , by equation of motion .

Hence, this is the required solution .

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

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