A 100 Kg Mass, Initially at Rest, Is Blown Apart

question 12

Multiple Choice

A 100 kg mass, initially at rest, is blown apart into a 90.0 kg piece and a 10.0 kg piece. After the blast, the two masses are moving apart with a relative velocity of 100 m/s. The speed of the 10.0 kg mass after the explosion is 90.0 m/s. The total kinetic energy of the two masses after the explosion is

• A) 63,200 J.
• B) 45,000 J.
• C) 30,400 J.
• D) 23,400 J.
• E) 4,500 J.

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Definitions:

Frequency

The rate at which a repeated event happens in a given unit of time or space.

Null Hypothesis

a statistical hypothesis that assumes no effect or no difference between phenomena or populations.

Level of Significance

A threshold in statistical analysis that measures the probability of rejecting a true null hypothesis; commonly set at values like 0.05 or 0.01.

Headaches

A common physical ailment characterized by pain in any region of the head, varying greatly in intensity, pattern, and cause.