Q6. A rocket is launched vertically at \( 60 \, \text{m/s} \) from the ground. After \( 5 \, \text{s} \), a second rocket is launched at \( 45 \, \text{m/s} \). How long after the second launch do they meet? (Take \( g = 10 \, \text{m/s}^2 \))
- A. 4 s
- B. 5 s
- C. 4.5 s
- D. 6 s