1.) A body is made up of multiple parts that are attached to each other by sever

Question

1.) A body is made up of multiple parts that are attached to each other by several compressed springs. It has been shot from a cannon and at the peak of its trajectory the springs are released, causing the parts to fly apart. The center of mass of the two parts
a. travels in a straight line at constant speed.
b. is now a meaningless concept.
c. follows a path which depends on the relative masses of the parts.
d. continues along the same parabolic path as before.

2.) A rocket fully loaded with fuel is sitting in space far from any other body. The engine is started and the rocket starts to spew exhaust gases out of the back of the engine. Which of the following explains what happens?
a. The momentum of the exhaust gases must be equal to the momentum gained by the rocket.
b. The exhaust gases carry away momentum, but the rocket goes nowhere because the gases don't push on anything.
c. The exhaust gases have a higher velocity than the rocket because the force exerted on the gases by the rocket is bigger than the force exerted on the rocket by the gases.

Explanation / Answer

d. continues along the same parabolic path as before. a. The momentum of the exhaust gases must be equal to the momentum gained by the rocket.

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