Math Problem Statement

A cat runs and jumps from one roof top to another that is 5 meters away and 3 meters below.  What is the minimum horizontal speed with which the cat must jump off the first roof in order to make it to the other?  Round to the nearest whole number.

Solution

To solve this problem, we need to analyze the cat's motion in two directions: horizontal and vertical.

Vertical Motion:

The vertical displacement (Δy\Delta y) is 3 meters below the starting point, so: Δy=3m.\Delta y = -3 \, \text{m}.

We can use the kinematic equation for vertical motion: Δy=vy0t+12gt2,\Delta y = v_{y0} t + \frac{1}{2} g t^2, where:

  • vy0=0m/sv_{y0} = 0 \, \text{m/s} (since the cat is not initially moving vertically),
  • g=9.8m/s2g = 9.8 \, \text{m/s}^2 (acceleration due to gravity),
  • tt is the time of flight.

Substituting the known values: 3=0+12(9.8)t2,-3 = 0 + \frac{1}{2} (9.8) t^2, t2=69.8=0.6122,t^2 = \frac{-6}{-9.8} = 0.6122, t=0.61220.78seconds.t = \sqrt{0.6122} \approx 0.78 \, \text{seconds}.

Horizontal Motion:

Now, the horizontal displacement (Δx\Delta x) is 5 meters, and horizontal speed (vxv_x) is constant since there's no acceleration in the horizontal direction.

The relationship between horizontal displacement and time is: Δx=vxt.\Delta x = v_x t. Solving for vxv_x: vx=Δxt=50.786.41m/s.v_x = \frac{\Delta x}{t} = \frac{5}{0.78} \approx 6.41 \, \text{m/s}.

Rounding to the nearest whole number, the minimum horizontal speed the cat must have is: vx6m/s.v_x \approx 6 \, \text{m/s}.

Answer:

The minimum horizontal speed is 6 m/s.

Would you like further details or have any questions?

Here are 5 related questions:

  1. How does the height difference affect the required speed?
  2. What happens if the height difference were 0 meters?
  3. What is the effect of increasing the horizontal distance?
  4. How does air resistance affect real-world jumps?
  5. How would the time change if the gap was 10 meters instead of 5?

Tip: For projectile motion, vertical and horizontal components of motion are independent of each other.

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Math Problem Analysis

Mathematical Concepts

Projectile Motion
Kinematics
Vertical and Horizontal Motion

Formulas

Vertical displacement equation: Δy = v_{y0}t + 1/2 g t^2
Horizontal displacement equation: Δx = v_x t

Theorems

Independence of Horizontal and Vertical Motion
Kinematic Equations

Suitable Grade Level

Grades 9-12