Question

1. what is the potential energy of a 5 kg rock sitting on a 10 - meter - high ledge?

50 j
49 j
980 j
490 j

Explanation:

Step1: Recall the formula for gravitational potential energy

The formula for gravitational potential energy is \(U = mgh\), where \(m\) is the mass, \(g\) is the acceleration due to gravity (\(g = 9.8\space m/s^{2}\)), and \(h\) is the height.

Step2: Substitute the given values into the formula

Given \(m = 5\space kg\), \(h=10\space m\), and \(g = 9.8\space m/s^{2}\). Then \(U=(5\space kg)\times(9.8\space m/s^{2})\times(10\space m)\).

Step3: Calculate the result

\(U = 5\times9.8\times10=490\space J\)

Answer:

490 J