Question

A particle moves with a velocity under the influence of a constant force

$\vec { F } = 10 \hat { i } + 10 \hat { j } + 20 \hat { k } N$ The instantaneous power applied to the particle is

• A. 200 J-s^–1
• B. 40 J-s^–1
• C. 140 J-s^–1
• D. 170 J-s^–1

Answer 1

Answer: (C)

140 J-s^–1

Answer 2

$P = \vec { F } \cdot \vec { v }$