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Which one of the following groups have quantities that do not have the same dimensions?

1. pressure, stress
2. velocity, speed
3. force, impulse
4. energy, work

Correct answer: force, impulse

Solution

Force and impulse do not have the same dimensions. Force has dimensions of [MLT⁻²], while impulse, being force multiplied by time, has dimensions of [MLT⁻¹].

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