anonymous
  • anonymous
A soccer goalie kicks a ball. The ball leaves the goalie's foot with an initial upward velocity of 10 meters per second. If the ball is 1.5 meters off the ground when it leaves the goalie's foot, about how many seconds will it take for the ball to hit the ground? a.2.18 seconds b.4.36 seconds c.-0.14 seconds d.10.682 seconds
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Use d=Vit+0.5at^2 d will be -1.5m using the foot height as a starting point of 0. Vi will be 10m/s. a will be -9.81 since down is negative. Solving the quadratic you get 2.18 or -0.14. Negative time is nonsensical, so its 2.18

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