   Chapter 3, Problem 10CQ

Chapter
Section
Textbook Problem

A baseball is thrown from the outfield toward the catcher. When the ball reaches its highest point, which statement is true? (a) Its velocity and its acceleration are both zero, (b) Its velocity is not zero, but its acceleration is zero, (c) Its velocity is perpendicular to its acceleration, (d) Its acceleration depends on the angle at which the ball was thrown, (c) None of statements (a) through (d) is true.

To determine
Which statement is true, when a baseball is thrown from the outfield towards the catcher, at the highest point.

Explanation

A projectile is a motion whose velocities are independent of each other. The velocity along the horizontal direction is a constant for a projectile. The vertical velocity changes at all points. The net velocity is always tangential to the path.

The acceleration of the projectile along the horizontal direction is zero and in the vertical direction, the acceleration is equal to the acceleration due to gravity.

Conclusion:

At the highest point of a projectile, the vertical velocity is zero. Thus, the net velocity is in the horizontal direction. The acceleration is always directed vertically downwards...

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