Final answer:
The scene in Romeo and Juliet opens with Romeo in a joyful mood because of his love for Juliet, the belief that the feud between their families has been resolved, and the optimistic setting of the morning.
Step-by-step explanation:
The scene in Romeo and Juliet opens with Romeo in a joyful mood for several reasons. Firstly, Romeo is deeply in love with Juliet and their relationship brings him great happiness. Secondly, at this point in the play, Romeo believes that the feud between their families has been resolved and that he can finally be with Juliet without fear of consequence. This sense of relief and hope fills him with joy. Lastly, the scene is set in the morning, which is often associated with new beginnings and optimism, further contributing to Romeo's joyful mood.