Question

using only these supplies, which question can annie investigate with an experiment?
does a heavier ball travel farther than a lighter ball when launched from a catapult?
does a rubber ball travel farther when launched from a metal catapult or from a wooden catapult?
does a catapult with a longer arm launch a rubber ball farther than a catapult with a shorter arm?

Explanation:

To determine which question Annie can investigate with an experiment, we analyze each option based on the availability of supplies (implied to be consistent for a single - type catapult, same - type ball, and variable arm length or ball weight/material or catapult material):

Option 1: “Does a heavier ball travel farther than a lighter ball when launched from a catapult?”

To test this, Annie would need balls of different weights. But we don't know if she has balls of different weights available. If the supplies only include, say, rubber balls of the same weight or a single type of ball, she can't change the weight variable.

Option 2: “Does a rubber ball travel farther when launched from a metal catapult or from a wooden catapult?”

For this experiment, Annie would need a metal catapult and a wooden catapult. If her supplies only include one type of catapult (e.g., only a wooden catapult or only a metal catapult), she can't change the catapult - material variable.

Option 3: “Does a catapult with a longer arm launch a rubber ball farther than a catapult with a shorter arm?”

Annie can modify the arm length of a single catapult (or use two catapults with different arm lengths if available in her supplies) while keeping the ball (rubber ball) and the basic catapult design the same. This variable (arm length) is more likely to be manipulable with common supplies for a catapult experiment, as she can adjust the arm length (e.g., by attaching different - length sticks) and use the same rubber ball and catapult base.

Answer:

Does a catapult with a longer arm launch a rubber ball farther than a catapult with a shorter arm?