Paragraph for Questions 56 and 57: A 4.0-kg block slides along a frictionless surface with a con...

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Paragraph for Questions 56 and 57: A 4.0-kg block slides along a frictionless surface with a constant speed of \( 5.0 \mathrm{~m} / \mathrm{s} \) as shown. Two seconds after it begins sliding, a horizontal, time-dependent force is applied to the mass. The force is removed 8 s later. The graph shows how the force on the block varies with time.
56. What is the magnitude of the total impulse of the force acting on the block?
(A) \( 20 \mathrm{Ns} \)
(B) \( 42 \mathrm{~N} \mathrm{~s} \)
(C) \( 48 \mathrm{Ns} \)
(D) \( 54 \mathrm{Ns} \)
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