Anna used a rock to drive a peg into the ground to put up her tent. If the rock applied a 9.5 N force in 0.50 s, what is the impulse on the peg?
Answer
A
4.8 N • s
B
9.5 N • s
C
10 N • s
D
19 N • s
Explanation
Impulse equals force multiplied by the time the force acts: 9.5 N × 0.50 s = 4.75 N·s. Rounded to two significant figures, the impulse is 4.8 N·s, choice A.
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