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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?

Respuesta :

Edufirst
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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