A constant force of 4 N acts for 3 s. What is the impulse?

A) 6 N·s

B) 18 N·s

C) 12 N·s

D) 24 N·s

Answer: C

Explanation: Use impulse = force × time for the stated idealized conditions. Substitution gives 4 × 3 = 12 N·s.

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