Final answer:
To find the time it takes for a fruit to drop from a 20m tall tree, you can use the equation of motion for free fall. By plugging in the known values into the formula, you can solve for time, which is 2 seconds.
Step-by-step explanation:
To calculate the time it takes for the fruit to reach the ground from a 20m tall tree, we can use the formula s = ½ gt², where s is the distance fallen, g is the acceleration due to gravity, and t is the time in seconds. Plugging in the given values: 20m = ½ (10 m/s²) t², we get t² = 4. Therefore, t = 2 seconds.
Answering the student's question directly, the time it takes for the fruit to reach the ground is 2 seconds (option b).