Answer:
option (e) is correct.
Explanation:
mass of adult, M = 81 kg
Gravitational Potential energy of adult, U = 2000 J
Let the height raised is h.
U = mass of adult x g x h
2000 = 81 x 9.8 x h
h = 2.52 m
mass of adult, m = 18 kg
height raised, h = 2.52 m
Potential energy of child, U' = m x g x h
U' = 18 x 2.52 x 9.8 = 444.44 J
Thus, option (e) is correct.
Yes because something that has been electrically charged can make other things move without touching them ( this is called force without contact)
Hoped this helped :)
<span>it either changes the direction of the object or it stops the object in motion.</span>
energy is the ability to do work while work is the dot product of force and displacement
To answer your question it is true