John starts on a walk from his house at 9 AM. He reaches his destination 4.5 km away from his house at 10:30 AM. What wasJohn's average speed?(A) 0.43 km/hrB 4.5 km/hr0.5 km/hr(D 3 km/hr A ball dropped from the rooftop of a building takes 2.0 s to reach the ground. What is the height of the building?(A) 1.9 mB) 19.6 m(c) 9.8 m(D 39.2 m

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John starts on a walk from his house at 9 AM. He reaches his destination 4.5 km away from his house at 10:30 AM. What was John's average speed? A 0.43 km/hr B 4.5 km/hr C 0.5 km/hr 3 km/hr

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.

Question

John starts on a walk from his house at 9 AM. He reaches his destination 4.5 km away from his house at 10:30 AM. What was
John's average speed?
(A) 0.43 km/hr
B 4.5 km/hr
0.5 km/hr
(D 3 km/hr

A ball dropped from the rooftop of a building takes 2.0 s to reach the ground. What is the height of the building?
(A) 1.9 m
B) 19.6 m
(c) 9.8 m
(D 39.2 m

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