Speed =dist./time
=73.4/5
=14.68 km/hr
Answer:
116.67 km/h
Explanation:
avarge speed = total distance / total time
Answer: 490 / 4.2 = 116.67 km/h
<h2>Answer</h2>
Gravitational potential energy of the textbook-Earth system relative to the desk = 98 N/m
<h2>Explanation</h2>
Given that,
Mass of history book = 8kg
height of book from ground = 1.25m
acceleration due to gravity = 9.8m/s²
<h3>gravitational potential energy formula</h3><h2>GPE = Fg⋅h</h2><h2>GPE = mgh</h2>
where ,
m = mass of object(book)
g = acceleration due to gravity
h = the altitude of the object.
GPE = 8(9.8)(1.25)
= 98 N/m
So, gravitational potential energy of the textbook-Earth system relative to the desk = 98 N/m
