Question

I tried working this out and I got 495 which is wrong. im not sure what to do.

A two-stage rocket moves in space at a constant velocity of 4650 m/s. The two stages are then separated by a small explosive charge placed between them. Immediately after the explosion the velocity of the 1240-kg upper stage is 5640 m/s in the same direction as before the explosion. What is the velocity (magnitude and direction) of the 2320-kg lower stage after the explosion?

Answer 1

A 10-kg block is hanging from a spring with spring constant K = 1000 N/m. The spring is attached to the ceiling of an elevator. The elevator is currently moving upwards at 10 m/s and slowing down at 1.0 m/s2. How much is the spring stretched