Arrange the examples in order, starting with the object that has the least amount of energy. In each case, assume there’s no friction. Use g = 9.8 m/s2, PE = m × g × h, and . a book with a mass of 0.75 kilograms resting on a shelf at a height of 1.5 meters a brick with a mass of 2.5 kilograms falling with a velocity of 10 meters/second when it’s 4 meters above ground a ball with a mass of 0.25 kilograms rolling on flat ground with a velocity of 10 meters/ second a stone with a mass of 0.7 kilograms being held still at a height of 7 meters ↑ ↑ ↑
Answers
Answer:
from gravitation..................
Answer: a book with a mass of 0.75 kilograms resting on a shelf at a height of 1.5 meters< a ball with a mass of 0.25 kilograms rolling on flat ground with a velocity of 10 meters/second< a stone with a mass of 0.7 kilograms being held still at a height of 7 meters< a mass of 2.5 kilograms falling with a velocity of 10 meters/second when it’s 4 meters above ground
Explanation: Gravitational potential energy is the energy possessed by an object due to its position or height.Kinetic energy is the energy possessed by an object by virtue of its motion.
m= mass of object
g= gravity
h= height of an object
v= velocity of object
A) a book with a mass of 0.75 kilograms resting on a shelf at a height of 1.5 meters
B) a mass of 2.5 kilograms falling with a velocity of 10 meters/second when it’s 4 meters above ground
total energy= (K.E+P.E) =(125+98) =223J
C) a ball with a mass of 0.25 kilograms rolling on flat ground with a velocity of 10 meters/second
D) a stone with a mass of 0.7 kilograms being held still at a height of 7 meters
P.E=0.7kg\times 9.8ms^{-2}\times 7m=48.02J