local myObj = display.newRect(display.contentWidth * 0.5, display.contentHeight * 0.5, 25, 25)
myObj.strokeWidth = 3
myObj:setFillColor(140, 140, 140)
myObj:setStrokeColor(180, 180, 180)

local onTouch = function( event )
    if event.phase == "began" or event.phase == "moved" then
    local objDistance = math.sqrt((event.x-myObj.x)^2+(event.y-myObj.y)^2)
    local objVelocity = 0.1
        local objTime = objDistance / objVelocity
        local tween = transition.to( myObj, { x = event.x, y = event.y, time = objTime } )
    end
end
local function startGame()
    Runtime:addEventListener( "touch", onTouch )
end
startGame()