Martina hits a volleyball ball upward with an initial velocity of 13 meters/sec. when she hits the ball, it is one meter above the ground. how long will it take the ball to hit the ground?

the ball will take 6.5 seconds to hit the ground

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during a tunnel construction project, engineers used explosives to excavate partway into a mountain. but due to constraints and environmental concerns, they later introduced a tunnel boring machine (tbm) to excavate the rest of the tunnel. the length and of the completed tunnel (in feet) is based on the number of days since the tbm started working. the length can be calculated using the equation y = 25x + 225. what does the y-intercept represent in this scenario?