In a thought experiment, a projectile is launched vertically from Earth's surface. Its initial velocity is less than the escape velocity.
The behaviour of the projectile can be analysed by using two different models, Model
The effects of Earth's atmosphere and Earth's rotational and orbital motions can be ignored.
Compare the maximum height reached by the projectile, using each model. In your answer, describe the energy changes of the projectile. (4 marks)
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