A 40-Kg Mass, Initially at Rest on a Horizontal Frictionless Surface

question 87

Multiple Choice

A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?

• A) 2.0 m/s
• B) 2.7 m/s
• C) 4.9 m/s
• D) 2.4 m/s
• E) 3.6 m/s

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