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(See attached files for full problem description with units and diagrams) --- A package of mass is released from rest at a warehouse loading dock and...

(See attached files for full problem description with units and diagrams)
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A package of mass  is released from rest at a warehouse loading dock and slides down a 3.0-m-high frictionless chute to a waiting truck. Unfortunately, the truck driver went on a break without having removed the previous package, of mass 2  , from the bottom of the chute.    
Part A
Suppose the packages stick together. What is their common speed after the collision?
Part B
Suppose the collision between the packages is elastic. To what height does the package of mass  rebound?
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A block sliding along a horizontal frictionless surface with speed  collides with a spring and compresses it by 2.0 cm. What will be the compression if the same block collides with the spring at a speed of  
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The figure is the potential-energy diagram for a 500 g particle that is released from rest at A.    
What are the particle's speeds at B, C, and D?
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Part A
Suppose the packages stick together. What is their common speed after
the collision?
Part B
rebound?

 
What are the particle's speeds at B, C, and D?
Answer:
Vb= ?
Vc=?
Vd=?

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