Chapter 3, Problem 6CQ

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

# Determine which of the following moving objects obey the equations of projectile motion developed in this topic. (a) A ball is thrown in an arbitrary direction. (b) A jet airplane crosses the sky with its engines thrusting the plane forward. (c) A rocket leaves the launch pad. (d) A rocket moves through the sky after its engines have failed. (e) A stone is thrown under water.

To determine
Which of the objects obey the equations of projectile motion.

Explanation

A projectile motion is having a certain set of equations that apply to a set of moving objects. For the object to obey the projectile equations, the motion of the body should be under the influence of gravity alone. Also, the only acceleration that must be acting on the body is the acceleration due to gravity, directed vertically downwards.

Conclusion:

A ball thrown arbitrarily has only the gravitational force acting on it and it moves with the initial velocity supplied by the boy. As the motion is under the influence of gravity alone, the projectile equations are obeyed here.

After the engines of a rocket have failed, the motion of the rocket is with the help of gravity alone, using the initial velocity provided by the engines before they died. So, the projectile equations are obeyed here.

Thus, the correct choices are (a) and (d)

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