21. ssm A two-stage rocket moves in space at a constant velocity of 4900 m/s. The two stages are then separated by a small explosive charge placed between them. Immediately after the explosion the velocity of the 1200-kg upper stage is 5700 m/s in the same direction as before the explosion. What is the velocity (magnitude and direction) of the 2400-kg lower stage after the explosion?

 

The small explosive charge produces only internal forces between the two stages of the rocket, so no external forces.  Momentum is conserved.

 

 

 

 

 

 

 

 

Note since this is positive the lower stage is moving in the same direction as the upper stage and both are in the same as the original direction.

 

 

 

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This page last updated on January 11, 2020