Final answer:
String theory is not suitable for predicting the trajectory of a horizontally thrown mass point due to its focus on unifying the fundamental forces and explaining quantum gravity.
Step-by-step explanation:
String theory, while a powerful theoretical framework, is not suitable for predicting classical mechanics scenarios like the trajectory of a horizontally thrown mass point. String theory is primarily concerned with unifying the four fundamental forces of nature and explaining quantum gravity. However, it does not provide an exact mathematical formulation to derive the trajectory of a horizontally thrown mass point, as its mathematical complexity makes it challenging to directly apply to such scenarios, often requiring approximations and simplifications.