An 80-G Bullet Is Suddenly Shot into a 4 $1400 \mathrm {~N} / \mathrm { m }$

question 34

Multiple Choice

An 8.0-g bullet is suddenly shot into a 4.0-kg block,at rest on a frictionless horizontal surface,as shown in the figure.The bullet remains lodged in the block.The block then moves against a spring and compresses it by 8.9 cm.The force constant (spring constant) of the spring is $1400 \mathrm {~N} / \mathrm { m }$ What is the magnitude of the impulse on the block (including the bullet inside) due to the spring during the entire time interval during which the block compresses the spring?

• A)13 N ∙ s
• B)12 N ∙ s
• C)10 N ∙ s
• D)8.3 N ∙ s
• E)6.7 N ∙ s

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