A constant force of 5 N acts for 4 s. What is the impulse?

A) 10 N·s

B) 20 N·s

C) 30 N·s

D) 40 N·s

Answer: B

Explanation: Use impulse = force × time for the stated idealized conditions. Substitution gives 5 × 4 = 20 N·s.

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