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There are three particles shown in the figure as I, II and III. The velocity and acceleration vectors associated with the motion of three particles are shown. Which of the above could represent the velocity and acceleration vectors for a projectile following a parabolic path? I. II. III.

1. I only
2. II only
3. III only
4. I and II only E. II and III only

Correct answer: III only

Solution

A projectile in ideal motion has constant acceleration due to gravity, which points straight down at all times. Its velocity must be tangent to the parabolic path, so only the diagram matching both conditions can be correct.

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