A Block of Mass M = 9 $0.50 \mathrm {~m} / \mathrm { s }$

question 7

Multiple Choice

A block of mass m = 9.0 kg and speed V and is behind a block of mass M = 27 kg and speed of $0.50 \mathrm {~m} / \mathrm { s }$ as shown int the figure.The surface is frictionless,and the blocks suddenly collide and couple.After the collision,the blocks have a common speed of 0.90 m/s.How much kinetic energy of the blocks is lost due to the collision?

• A)8.6 J
• B)2.0 J
• C)4.6 J
• D)11 J
• E)31 J

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