What is the potential energy of a 3 kg rock on top of a 40 m cliff? a120 J b1176 J c360 J d420
Question
What is the potential energy of a 3 kg rock on top of a 40 m cliff? a120 J b1176 J c360 J d420
Solution
The potential energy (PE) of an object can be calculated using the formula:
PE = mgh
where: m = mass of the object (in kg) g = acceleration due to gravity (approx. 9.8 m/s² on Earth) h = height above the ground (in m)
Given in the problem: m = 3 kg g = 9.8 m/s² h = 40 m
Substituting these values into the formula gives:
PE = 3 kg * 9.8 m/s² * 40 m = 1176 J
So, the potential energy of the rock is 1176 Joules. The correct answer is (b) 1176 J.
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