Women's Volleyball: Net Height & Court Limits

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SUMMARY

In women's volleyball, the net height is set at 2.24 meters, and the endline is 9.00 meters from the net. To determine the minimum initial speed required for a jump serve that strikes the ball at 3.00 meters above the floor and 8.00 meters horizontally from the net, one must apply projectile motion equations. The relevant equations include the horizontal and vertical motion equations, which are x(t) = (1/2)a_x t^2 + v_{0_x}t + x_0 and y(t) = (1/2)a_y t^2 + v_{0_y}t + y_0. By isolating time in the horizontal equation and substituting it into the vertical equation, one can derive the necessary initial speed calculations.

PREREQUISITES
  • Understanding of projectile motion principles
  • Familiarity with kinematic equations
  • Basic algebra for isolating variables
  • Knowledge of trigonometric functions for angle calculations
NEXT STEPS
  • Study the derivation of projectile motion equations
  • Learn how to apply kinematic equations in real-world scenarios
  • Explore the effects of initial velocity and angle on projectile trajectories
  • Investigate optimization techniques for maximizing serve effectiveness in volleyball
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Students studying physics, volleyball coaches, sports scientists, and anyone interested in the mechanics of athletic performance in volleyball.

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1. For women's volleyball the top of the net is 2.24m above the floor and the endline is 9.00m from the net. Using a jump serve, a player strikes the ball at a point 3.00 m above the floor and 8.00m (horizontally) from the net. If the initial velocity of the ball is horizontal and directed perpendicular to the endline, (a) calculate the minimum initial speed the ball must have to clear the net. (b) calculate the maximum initial speed the ball can have to stay inside the court.
 
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What equations do you think are relevant? How do you think you should approach the problem?

Please show us your work and where you get stuck. We're here to help you with your homework, not to do them for you.
 
Well, initially I thought to find theta and solve for V0x=V0cos(theta) but I have no initial velocity. I'm stuck trying to find an equation that I don't need time or velocity for. I just can't quite figure out where to start.
 
Try and synthesize an equation describing the trajectory of the projectile.

x(t)=\tfrac{1}{2}a_x t^2+v_{0_x}t+x_0

y(t)=\tfrac{1}{2}a_y t^2+v_{0_y}t+y_0

Try and build the function y(x) by isolating t(x) and then plugging it into the y(t) equation.
It should be smooth sailing from there on, just a question of plugging in the x and y values for each situation.
 

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