Calculating acceleration of gravity on a planet

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SUMMARY

The discussion centers on calculating the acceleration of gravity on a planet based on an astronaut's jump. Using the kinematic equation Vf^2 = Vi^2 + 2a(Xf - Xi), the initial speed (Vi) is 9 m/s, and the maximum horizontal distance (Xf - Xi) is 30 m. The calculated acceleration (a) is -1.35 m/s², but the solution is incorrect due to the neglect of the projectile's two-dimensional motion. The optimum launch angle for maximizing range and the Range Equation are crucial concepts that need to be considered for accurate calculations.

PREREQUISITES
  • Understanding of kinematic equations, specifically Vf^2 = Vi^2 + 2a(Xf - Xi)
  • Knowledge of projectile motion and its components
  • Familiarity with the Range Equation for projectile motion
  • Basic algebra for solving equations
NEXT STEPS
  • Study the Range Equation for projectile motion to understand how to maximize distance
  • Learn about the optimal launch angle for projectiles, which is typically 45 degrees
  • Explore two-dimensional motion analysis in physics
  • Review kinematic equations for both horizontal and vertical components of motion
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and projectile motion, as well as educators looking to clarify concepts related to gravity and motion calculations.

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Homework Statement


An astronaut on a strange planet finds that he can jump a maximum horizontal distance of 30m if his initial speed is 9m/s. What is the acceleration of gravity on the planet?

Homework Equations


Vf^2=Vi^2+2a(Xf-Xi)

The Attempt at a Solution


I used the formula mentioned above, plugged in number
Vf=0m/s
Vi=9m/s
X=Xf-Xi=30m
and get a=-1.35m/s^2

I'm not sure if it is correct, could someone double check and tell me if I did anything wrong? Thanks
 
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Consider the trajectory of the jump: It's not a one-dimensional linear motion but rather a 2D curve, one with both horizontal and vertical components. The kinematic equation that you've chosen applies to motion in one dimension and doesn't take into account splitting the given velocity into components.

What's the optimum launch angle to maximize the range of a projectile? Have you covered the Range Equation in your classes? (If not you might want to look it up and try to remember it; it can really come in handy to avoid re-deriving the range of a projectile every time).
 
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