Question
What is the momentum of a 7:4-kg'pug .. a) At rest? b) Walking at 0.2m/s c) Running at 4.4m/s ?
Answer
4.3
(260 Votes)
Ivy
Professional · Tutor for 6 years
Answer
a) 0b) 7.4kg * 0.2m/s = 1.48 kg.m/s c) 7.4kg * 4.4m/s = 32.56 kg.m/s
Explanation
The concept used to answer this question is momentum. Momentum is simply the mass of an object multiplied by its velocity. Keep in mind, momentum is a vector quantity, meaning it has both magnitude and direction. Here we're just concerned with magnitude, so direction is not important to our answers. a) An object at rest has a velocity of 0. Since Momentum = Mass * velocity, when velocity = 0, hence, momentum = 0, no matter what mass we are dealing with.b & c) For these two, we simply perform the same calculation (i.e., multiply the mass by the given velocities).