Why is acceleration downward in projectile motion?

Sarah00 · Jul 4, 2015

Homework Statement

Multiple-choice question: A boy stands 20 m away from a building and kicks a ball with initial velocity of 40 m/s at an angle 37°. The ball acceleration at the maximum height is: options A) +10i m/s², B) +10j m/s², C) -10i m/s², D) -10j m/s², E) 0 m/s².

Homework Equations

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The Attempt at a Solution

I know that the acceleration is downward always with value of 10m/s2
The answer is D? because j denote vertical axis and negative sign means downward?
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Dr. Courtney · Jul 4, 2015

It wouldn't hurt to write down the kinematic equations for the projectile motion in step 2.

SammyS · Jul 4, 2015

Sarah00 said:

Homework Statement

Homework Equations

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The Attempt at a Solution

I know that the acceleration is downward always with value of 10m/s2
The answer is D? because j denote vertical axis and negative sign means downward?[/B]

Yes.

Why is acceleration downward in projectile motion?

Homework Statement

Homework Equations

The Attempt at a Solution

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Homework Statement

Homework Equations

The Attempt at a Solution

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