Math Problem Statement

A projectile is launched with a speed of 40m/s at an angle of 60° from the horizontal. What is the maximum height reached by the projectile? Calculate its range

Solution

To calculate the maximum height and range of a projectile, we will use the following physics equations based on projectile motion.

Given dataTo calculate the maximum height and range of a projectile, we will use the following physics equations based on projectile motion.

Given

  • Initial speed, v0=40m/sv_0 = 40 \, \text{m/s}
  • Angle of projection, θ=60\theta = 60^\circ
  • Acceleration due to gravity, g=9.8m/s2g = 9.8 \, \text{m/s}^2

1. Maximum Height

The formula for the maximum height HH is:

H=(v0sinθ)22gH = \frac{(v_0 \sin \theta)^2}{2g}

Let's break it down:

  • Vertical component of velocity: v0y=v0sinθv_{0y} = v_0 \sin \theta

Plugging in the values:

v0y=40sin60=40×32=40×0.866=34.64m/sv_{0y} = 40 \sin 60^\circ = 40 \times \frac{\sqrt{3}}{2} = 40 \times 0.866 = 34.64 \, \text{m/s}

Now, applying the formula for maximum height:

H=(34.64)22×9.8=1199.0619.6=61.17mH = \frac{(34.64)^2}{2 \times 9.8} = \frac{1199.06}{19.6} = 61.17 \, \text{m}

2. Range

The formula for the range RR of a projectile is:

R=v02sin2θgR = \frac{v_0^2 \sin 2\theta}{g}

We need sin2θ\sin 2\theta: sin2θ=sin(2×60)=sin120=sin60=0.866\sin 2\theta = \sin (2 \times 60^\circ) = \sin 120^\circ = \sin 60^\circ = 0.866

Now, using the range formula:

R=402×0.8669.8=1600×0.8669.8=1385.69.8=141.39mR = \frac{40^2 \times 0.866}{9.8} = \frac{1600 \times 0.866}{9.8} = \frac{1385.6}{9.8} = 141.39 \, \text{m}

Final Answers:

  • Maximum height: 61.17m61.17 \, \text{m}
  • Range: 141.39m141.39 \, \text{m}

Would you like more details or clarifications on any part of the solution?

Here are 5 related questions for practice:

  1. What is the time of flight for this projectile?
  2. How does changing the angle affect the maximum height and range?
  3. What would be the maximum height if the launch speed was 50 m/s instead?
  4. How would air resistance affect the range of the projectile?
  5. What is the horizontal velocity of the projectile throughout its flight?

Tip: In projectile motion, the horizontal velocity remains constant, but the vertical velocity changes due to gravity.

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Math Problem Analysis

Mathematical Concepts

Projectile Motion
Kinematics
Trigonometry

Formulas

Maximum Height: H = (v_0 sin(θ))^2 / 2g
Range: R = v_0^2 sin(2θ) / g

Theorems

Projectile motion formulas derived from kinematic equations
Trigonometric identities

Suitable Grade Level

Grades 10-12