What speed does the catapult give a pebble of mass m/3 when stretched to a distance d?

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What speed does the catapult give a pebble of mass m/3 when stretched to a distance d?

A simple catapult, consisting of a leather pouch attached to rubber bands tied to two prongs of a wooden Y, has a spring constant k and is used to shoot a pebble horizontally. When the catapult is stretched by a distance d, it gives a pebble of mass m a launch speed v. Answer choices for Questions 9 and 10:

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