Finding gravitational acceleration

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SUMMARY

The discussion centers on calculating gravitational acceleration on another planet where a cannon is fired straight up at an initial velocity of 25 m/s, reaching a maximum height of 50 m. The correct approach involves using the kinematic equation \(v^2 = v_i^2 + 2as\), where \(v\) is the final velocity (0 m/s at the peak), \(v_i\) is the initial velocity (25 m/s), and \(s\) is the maximum height (50 m). The gravitational acceleration is determined to be -6.25 m/s², correcting the initial miscalculation of -12.5 m/s².

PREREQUISITES
  • Understanding of kinematic equations
  • Familiarity with initial and final velocity concepts
  • Knowledge of maximum height in projectile motion
  • Basic algebra for solving equations
NEXT STEPS
  • Study the kinematic equation \(v^2 = v_i^2 + 2as\) in detail
  • Learn about projectile motion and its applications
  • Explore the concept of gravitational acceleration on different celestial bodies
  • Practice solving problems involving maximum height and initial velocity
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Students studying physics, educators teaching kinematics, and anyone interested in understanding gravitational effects on projectile motion.

BTurner90
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Homework Statement


A cannon is fired on another planet straight up at 25 m/s. It reaches a maximum height of 50m. What is the value of the gravitational acceleration?


Homework Equations


v = v_i + at
x = .5 (v_i + vt)


The Attempt at a Solution


using the first equation,
a = (v - v_i)/t
a = (0-25)/2
g = -12.5 m/s^2
Where am I going wrong? Thanks
 
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Hi BTurner90! Welcome to PF! :smile:

(try using the X2 tag just above the Reply box :wink:)
BTurner90 said:
A cannon is fired on another planet straight up at 25 m/s. It reaches a maximum height of 50m. What is the value of the gravitational acceleration?

There are three standard constant acceleration equations, so choose the one that only has what you already know, and what you want to know.

In this case, you don't have t, and nobody's asking you for it, so choose an equation with u v a and s. :wink:
 

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