shawnk9741 shawnk9741

05-06-2017
Physics

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A bullet shot straight up returns to its starting point in 10 s. what is the initial speed of the bullet, assuming negligible air resistance?

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Edufirst Edufirst

17-06-2017

Time to return = flight time = 10 s

Time to reach the maximum height = flight time / 2 = 10s / 2 = 5s

Speed at the maximum height = Vf = 0

Velocity formula: Vf = Vo - g*t => Vo = Vf + gt

   Vf = 0
   g = 9.8 m/s^2
   t = 5s

Vo = 0 + 9.8 m/s^2 * 5s = 49 m/s

Answer: 49 m/s

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