A committee was appointed Monday by the Joplin City Council to study potential street projects that could be done in the next 10 years if voters would agree to extend the city’s three-eighths-cent sales tax for capital improvements. Voters will have to decide whether to continue the tax, used largely for street building and widening. The city staff will ask the City Council later to place it on a ballot this year. The tax was first approved in 2004.