A 120 Kg Mass, Initially at Rest, Is Blown Apart

question 60

Multiple Choice

A 120 kg mass, initially at rest, is blown apart into a 80 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The speed of the 80 kg mass is

• A) 59 m/s.
• B) 51 m/s.
• C) 34 m/s.
• D) 20 m/s.
• E) 14 m/s.

Differentiate between dependent and independent variables in experiments.

Understand the concept of correlation, including positive and negative correlations, and their implications.

Grasp the importance of representative samples in research and how they are constituted.

Understand the concept and function of control groups, random assignment, and placebo effects in experimental research.

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