Which of the following is equal to 1 Joule1 \text{ Joule}1 Joule?
1 kg⋅m2/s21 \text{ kg}\cdot\text{m}^2/\text{s}^21 kg⋅m2/s2
1 N⋅m1 \text{ N}\cdot\text{m}1 N⋅m
1 W⋅s1 \text{ W}\cdot\text{s}1 W⋅s
1 kg⋅m/s21 \text{ kg}\cdot\text{m}/\text{s}^21 kg⋅m/s2