Two Spacemen Are Floating Together with Zero Speed in a Gravity-Free

question 2

Multiple Choice

Two spacemen are floating together with zero speed in a gravity-free region of space.The mass of spaceman A is 120 kg and that of spaceman B is 90 kg.Spaceman A pushes B away from him with B attaining a final speed of 0.5 m/s.The final recoil speed of A is:

• A)0 m/s
• B)0.38 m/s
• C)0.43 m/s
• D)0.50 m/s
• E)1.0 m/s

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Definitions:

Determinant

A scalar value that can be calculated from the elements of a square matrix and encapsulates certain properties of the matrix. It is often used to determine the invertibility of the matrix.

Cramer's Rule

A theorem in algebra that provides an explicit solution to a system of linear equations with as many equations as unknowns, using determinants.

System of Linear Equations

A set of one or more linear equations that share the same variables.

Interest Rate

A percentage representing the cost of borrowing money or the return on investment for savings.