Answer:
Option a is correct
Potential Energy of the rock is 10,500j.
Step-by-step explanation:
Given: A rock has a mass (m) of 25 kg, the acceleration due to gravity(g) is [tex]10m/s^2[/tex] and the height of the rock (h) is, 42m.
Formula for potential energy depends on the force acting on the objects is P=mgh, where P is potential energy, m is mass, g is acceleration due to gravity, and h is height.
Substitute the value of m=25kg , g=[tex]10m/s^2[/tex] and h=42m in above formula; we have,
[tex]P=(25kg)\cdot(10m/s^2)\cdot(42m)[/tex]
⇒ [tex]P=10,500 kg m^2/s^2[/tex]
Using Conversion: [tex]1 joule(j) =kg m^2s^{-2}[/tex]
Therefore, the potential energy of the rock is, P = 10,500j
