# Physics

A regulation volleyball court is L = 18.0 m long and a regulation volleyball net is d = 2.43 m high. A volleyball player strikes the ball a height h = 1.76 m directly above the back line, and the ball's initial velocity makes an angle q = 55° with respect to the ground. At what initial speed must the ball be hit so that it just barely makes it over the net? (Assume the volleyball is hit so that its path is parallel to the side-line as seen from an observer directly above the court, and that the volleyball is a point object.)

Again, I need some of the first steps. I can probably get it after that.

1. 👍 0
2. 👎 0
3. 👁 199
1. You will also need to neglect air fraction to get an easy answer.

Solve for the value of V that puts the ball at the height of the net after traveling 9.0 m. (Nine meters is the half court length). You want the value of V that results in the ball being 0.67 m above the elevation where it was struck, at time T.

Vsin 55*T - (g/2)T^2 = 0.67
Vcos 55*T = 9.0

Two variables, two unknowns.

1. 👍 0
2. 👎 0
posted by drwls
2. Now it asks for the max. height. above the court reached by the ball. Do I use the equation Vf^2 = vi^2 + 2(g)(delta y) ?

1. 👍 0
2. 👎 0
posted by Lindsay
3. Start with the height that the ball was hit, and add an amount y such that
g y = (1/2) (Vsin 55)^2
since the ball took off at 55 degrees to horizontal.

The ball should have risen to a height higher then the net, and then passed just over it coming down

1. 👍 0
2. 👎 0
posted by drwls
4. Ok so I have the initial speed and the max height. Now it asks "At what initial speed must the ball be hit so that it lands directly on the opponent's back line?"
Do I use a process similar to that of the first question?

1. 👍 0
2. 👎 0
posted by Lindsay
5. yes, same process

1. 👍 0
2. 👎 0
posted by drwls
6. Would my equation for the x-dir. be Vcos 55*T = 18, since it's the full length of the court?

What would my height for the y-dir. be? Vsin 55*T - (g/2)T^2 = ???

1. 👍 0
2. 👎 0
posted by Lindsay
7. Yes, 18 m would be the length to use. The height (y change) would be MINUS the elevation where the ball was struck, since that would correspond to hitting the ground

1. 👍 0
2. 👎 0
posted by drwls

## Similar Questions

1. ### physics

A regulation volleyball court is L = 18.0 m long and a regulation volleyball net is d = 2.43 m high. A volleyball player strikes the ball a height h = 1.74 m directly above the back line, and the ball's initial velocity makes an

asked by Anonymous on August 5, 2018
2. ### Physics repost

A regulation volleyball court is L = 18.0 m long and a regulation volleyball net is d = 2.43 m high. A volleyball player strikes the ball a height h = 1.76 m directly above the back line, and the ball's initial velocity makes an

asked by Lindsay on November 8, 2007
3. ### Physics

A regulation volleyball court is L = 18.0 m long and a regulation volleyball net is d = 2.43 m high. A volleyball player strikes the ball a height h = 1.76 m directly above the back line, and the ball's initial velocity makes an

asked by Lindsay on November 12, 2007
4. ### Physics

A regulation volleyball court is L = 18.0 m long and a regulation volleyball net is d = 2.43 m high. A volleyball player strikes the ball a height h = 1.76 m directly above the back line, and the ball's initial velocity makes an

asked by Lindsay on November 12, 2007
5. ### Physics

A volleyball court is 18 m long from baseline to baseline and the net is 2.24 m high. A volleyball player serves the ball from the baseline by hitting it at a height of 2 m above the floor at an angle of 10 degrees above the

asked by Beans on November 21, 2014
6. ### biology

Gene expression regulation by methylation of the cytosines in a promoter would be considered : Select one: a. Transcriptional regulation. b. Posttranscriptional regulation. c. Posttranslational regulation. d. Translational

asked by bobby on November 25, 2013
7. ### government

What problems did the Court have in the ear between the Civil war and the New Deal in trying to limit economic regulation? In attempting to limit regulation, was the Court reading its own political views into the Constitution or

asked by may on November 30, 2008
8. ### math

A sand volleyball court has an area of 144 square meters. Its perimeter is 50 meters. What are the dimensions of the volleyball court?

asked by Anonymous on May 9, 2018
9. ### Cincinnati state

The perimeter of a volleyball court is 180 feet, anditswidth is 40 feet Find the length of the volleyball court

asked by Teresa on September 24, 2015
10. ### Math

A volleyball is his upward by a player in a game. The height h (in fee) of the volleyball after t seconds is given by the function h=-16t^2+30t+6. What is the maximum height of the volleyball? explain your reasoning.

asked by Billy on November 17, 2010

More Similar Questions