Final answer:
The potential energy of a 3g fruit hanging 7m high is calculated using the formula PE = mgh. It comes out to approximately 0.21 J, which corresponds to option A.
Step-by-step explanation:
To calculate the potential energy (PE) of a fruit hanging from a branch, we use the formula PE = mgh, where m represents the mass of the object, g is the acceleration due to gravity (9.8 m/s2), and h is the height above the ground. Using the mass of the fruit (3g or 0.003 kg) and the height (7m), the potential energy can be calculated as follows:
PE = 0.003 kg * 9.8 m/s2 * 7 m = 0.2058 J
Therefore, the potential energy of the fruit is approximately 0.21 J, which corresponds to option A.