Math Problem Statement

2 objeccts are prjected w same velocity but dif angles so that they covner the dame range. angle of rojectile of 1 is pi/3 and its max height is h. then max height of 2nd is

Solution

Given that the two objects are projected with the same velocity but different angles, and they cover the same range, we are asked to find the maximum height of the second object when the first object's maximum height is given as hh.

Key concepts:

  1. Range of a projectile is given by the formula: R=v02sin(2θ)gR = \frac{v_0^2 \sin(2\theta)}{g} where:

    • v0v_0 is the initial velocity,
    • θ\theta is the launch angle,
    • gg is the acceleration due to gravity.
  2. Maximum height of a projectile is given by: H=v02sin2(θ)2gH = \frac{v_0^2 \sin^2(\theta)}{2g} where θ\theta is the angle of projection.

Since both projectiles cover the same range, we know that: R1=R2R_1 = R_2 This implies: v02sin(2θ1)g=v02sin(2θ2)g\frac{v_0^2 \sin(2\theta_1)}{g} = \frac{v_0^2 \sin(2\theta_2)}{g} Simplifying, we get: sin(2θ1)=sin(2θ2)\sin(2\theta_1) = \sin(2\theta_2) This means that 2θ1=π2θ22\theta_1 = \pi - 2\theta_2 (since sin(α)=sin(πα)\sin(\alpha) = \sin(\pi - \alpha)), so: θ2=π2θ1\theta_2 = \frac{\pi}{2} - \theta_1

Given:

  • θ1=π3\theta_1 = \frac{\pi}{3}
  • The maximum height for the first projectile is H1=hH_1 = h.

For the first projectile:

The maximum height is: h=v02sin2(θ1)2g=v02sin2(π3)2gh = \frac{v_0^2 \sin^2(\theta_1)}{2g} = \frac{v_0^2 \sin^2\left(\frac{\pi}{3}\right)}{2g} Since sin(π3)=32\sin\left(\frac{\pi}{3}\right) = \frac{\sqrt{3}}{2}, we get: h=v02(32)22g=v02342g=3v028gh = \frac{v_0^2 \left(\frac{\sqrt{3}}{2}\right)^2}{2g} = \frac{v_0^2 \cdot \frac{3}{4}}{2g} = \frac{3v_0^2}{8g}

For the second projectile:

The angle θ2\theta_2 is π2π3=π6\frac{\pi}{2} - \frac{\pi}{3} = \frac{\pi}{6}.

The maximum height for the second projectile is: H2=v02sin2(θ2)2g=v02sin2(π6)2gH_2 = \frac{v_0^2 \sin^2(\theta_2)}{2g} = \frac{v_0^2 \sin^2\left(\frac{\pi}{6}\right)}{2g} Since sin(π6)=12\sin\left(\frac{\pi}{6}\right) = \frac{1}{2}, we get: H2=v02(12)22g=v02142g=v028gH_2 = \frac{v_0^2 \left(\frac{1}{2}\right)^2}{2g} = \frac{v_0^2 \cdot \frac{1}{4}}{2g} = \frac{v_0^2}{8g}

Relation between hh and H2H_2:

From the equation for hh: h=3v028gh = \frac{3v_0^2}{8g} we can now express H2H_2 in terms of hh: H2=v028g=h3H_2 = \frac{v_0^2}{8g} = \frac{h}{3}

Final Answer:

The maximum height of the second projectile is h3\frac{h}{3}.


Would you like more details on any part of this solution or have any questions?

Here are some additional questions for further exploration:

  1. How does the launch angle affect the range of a projectile?
  2. How would the maximum height change if the initial velocity was doubled?
  3. What is the impact of air resistance on the range and height of a projectile?
  4. How do we derive the formula for the range of a projectile?
  5. How can you calculate the time of flight for a projectile?

Tip: When solving projectile motion problems, always start by analyzing the given quantities (velocity, angle, range) and use the basic kinematic equations to relate them.

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Math Problem Analysis

Mathematical Concepts

Projectile Motion
Trigonometry
Kinematics

Formulas

Range of a projectile: R = (v0^2 * sin(2θ)) / g
Maximum height of a projectile: H = (v0^2 * sin^2(θ)) / (2g)

Theorems

Projectile motion theorem
Trigonometric identity sin(2θ) = sin(π - 2θ)

Suitable Grade Level

Grades 11-12