A person (starting from home) walks in a big open field at a constant speedof 5 m/s due East for 30 seconds, then at a constant speed of 6 m/s in adirection of 60° South of East for 50 seconds, and then at a constant speed of9 m/s due South for 2 minutes and then they stop. What is the magnitudeof the average velocity of this person from the beginning of this motion tothe end of this motion?(a) 4.87 m/s(d) 7.87 m/s(b) 5.87 m/s(e) 8.87 m/s(c) 6.87 m/s(f) None of the above. Suppose that a strong wind, having a constant acceleration of 5.0 m/s²,blowing parallel to the ground. If a rock is launched directly upward fromthe ground with an initial speed of 14.7 m/s, determine how far it will befrom this launch point when the rock comes back to hit the ground.(а) 12.5 m(d) 27.5 m(Ъ) 27.5 m(е) 32.5 m(c) 22.5 m(f) None of the above.

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College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.

Question

A person (starting from home) walks in a big open field at a constant speed
of 5 m/s due East for 30 seconds, then at a constant speed of 6 m/s in a
direction of 60° South of East for 50 seconds, and then at a constant speed of
9 m/s due South for 2 minutes and then they stop. What is the magnitude
of the average velocity of this person from the beginning of this motion to
the end of this motion?
(a) 4.87 m/s
(d) 7.87 m/s
(b) 5.87 m/s
(e) 8.87 m/s
(c) 6.87 m/s
(f) None of the above.

Suppose that a strong wind, having a constant acceleration of 5.0 m/s²,
blowing parallel to the ground. If a rock is launched directly upward from
the ground with an initial speed of 14.7 m/s, determine how far it will be
from this launch point when the rock comes back to hit the ground.
(а) 12.5 m
(d) 27.5 m
(Ъ) 27.5 m
(е) 32.5 m
(c) 22.5 m
(f) None of the above.

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