D
Explanation:
Mutiply and alagrab to subterc
An important aspect of fission reactions is that they produce free neutrons, which causes chain reactions.
Answer:
d
a balanced force acted on it and propelled it to 4,000 km/hr
Explanation:
For the neutrons star which is moving in outer space at 4,000 km/hr, it could only be possible as a result of the balanced force which had already acted on it. <em>This is based on newton's law of motion which states that 'To every action, there is equal and opposite reaction'. </em>
Answer:


Explanation:
See attachment for complete work.