Subjects physics

Projectile Receive 1Ed8B2

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1. **Problem Statement:** We need to create a logical scenario where a player receives a ball following a projectile motion path, specifically using case 2 of trajectory motion. 2. **Understanding Case 2 of Trajectory Motion:** Case 2 typically refers to projectile motion where the object is launched from a height and lands at a different height, or the motion involves an initial velocity at an angle with gravity acting downward. 3. **Scenario Setup:** Imagine a soccer player passing the ball to a teammate. The ball is kicked from the bottom-left side of the field (starting point) with an initial velocity at an angle, following a curved path (the dashed arrow) toward the center-top of the field where the receiving player is positioned. 4. **Mathematical Model:** The projectile motion equations are: $$x = v_0 \cos(\theta) t$$ $$y = v_0 \sin(\theta) t - \frac{1}{2} g t^2$$ where: - $v_0$ is the initial velocity, - $\theta$ is the launch angle, - $g$ is the acceleration due to gravity (9.8 m/s²), - $t$ is time, - $x$ and $y$ are horizontal and vertical positions respectively. 5. **Estimating Parameters:** Assume the ball is kicked with an initial speed $v_0 = 15$ m/s at an angle $\theta = 45^\circ$. 6. **Finding Time of Flight to Receiving Player:** Suppose the receiving player is located at horizontal distance $x = 20$ meters. From the horizontal motion: $$t = \frac{x}{v_0 \cos(\theta)} = \frac{20}{15 \times \cos(45^\circ)} = \frac{20}{15 \times \frac{\sqrt{2}}{2}} = \frac{20}{10.61} \approx 1.885 \text{ seconds}$$ 7. **Finding Vertical Position at that Time:** $$y = 15 \times \sin(45^\circ) \times 1.885 - \frac{1}{2} \times 9.8 \times (1.885)^2$$ $$= 15 \times \frac{\sqrt{2}}{2} \times 1.885 - 4.9 \times 3.553$$ $$= 15 \times 0.707 \times 1.885 - 17.4$$ $$= 20 - 17.4 = 2.6 \text{ meters}$$ 8. **Interpretation:** The ball reaches the receiving player at 20 meters horizontally and approximately 2.6 meters high, which is a reasonable height for a player to receive the ball in the air. **Final Answer:** The player receives the ball at $x=20$ meters and $y=2.6$ meters after approximately 1.885 seconds, following a projectile motion with initial speed 15 m/s at 45 degrees.