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In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
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Impact01:30

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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
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Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
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Related Experiment Video

Updated: Oct 2, 2025

Anterior Segment Organ Culture Platform for Tracking Open Globe Injuries and Therapeutic Performance
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Open globe injuries from projectile impact: Initial presentation and outcomes.

Angelica C Scanzera1, Yannek I Leiderman1, Maria S Cortina1

  • 1Department of Ophthalmology and Visual Sciences, Illinois Eye and Ear Infirmary, University of Illinois at Chicago, Chicago, IL, United States.

Indian Journal of Ophthalmology
|February 28, 2022
PubMed
Summary

Projectile injuries causing open globe injuries have good visual outcomes. Most patients achieve better than 20/40 vision after surgical repair, even with associated orbital fractures.

Keywords:
Injuryocular traumaopen globe injuryopen globe repairprojectile

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Area of Science:

  • Ophthalmology
  • Trauma Surgery

Background:

  • Open globe injuries are severe ocular traumas.
  • Projectile impacts represent a significant cause of these injuries, particularly in urban settings.

Purpose of the Study:

  • To characterize open globe injuries from projectile trauma.
  • To analyze surgical repair outcomes in affected patients.

Main Methods:

  • Retrospective review of 214 patients with projectile-related open globe injuries (2010-2016).
  • Data collected included demographics, injury type, wound characteristics, and clinical findings.
  • Outcomes assessed included further surgeries, visual acuity, and clinical status at >6 months follow-up.

Main Results:

  • 73 patients (34.1%) sustained projectile-related open globe injuries; predominantly male (mean age 37.9).
  • Lacerations were most common (68.5%), often anterior, with better visual outcomes than globe ruptures.
  • Orbital fractures correlated with poorer visual prognosis; 70% required additional surgeries, yet 58.5% achieved 20/40 or better vision.

Conclusions:

  • This study represents the largest cohort on projectile-related open globe injuries.
  • Visual prognosis is favorable, with a majority achieving good visual acuity post-surgery.