Physics
Physics
Problem
A toy rocket of mass is launched straight upward from rest. During the first its engine produces a constant upward thrust of . Neglect air resistance. What is the rocket’s upward speed at the instant the engine stops? a) b) c) d)Intuitive explanation
This is about applying Newton's second law during the powered phase of motion. The key is recognizing that the net force on the rocket comes from both the engine thrust and gravity pulling downward—you need to find the net force first, then use it to find acceleration, and finally use kinematics to get the final velocity. The engine's job is to overcome weight and accelerate the rocket upward simultaneously.
Intuitive explanation
This is about applying Newton's second law during the powered phase of motion. The key is recognizing that the net force on the rocket comes from both the engine thrust and gravity pulling downward—you need to find the net force first, then use it to find acceleration, and finally use kinematics to get the final velocity. The engine's job is to overcome weight and accelerate the rocket upward simultaneously.