Which of the following statements correctly explain the applications or characteristics of 'FORCE'? A. Force may bring a change in the shape of an object. B. Force may make a stationary object move. C. Force cannot change the direction of motion of an object. D. Force can change the speed of an object. E. Force can be a push or a pull. Choose the correct answer from the options given below:

Match List-I (Phenomenon) with List-II (Explanation): List-I (a) Contact Force (b) Non-contact Force (c) Frictional Force (d) Pressure List-II 1. Force exerted when two surfaces are in direct contact 2. Force exerted without physical contact 3. Force opposing relative motion between surfaces 4. Thrust acting per unit surface area Select the correct answer code:

According to Newton's second law of motion, if the acceleration of a body is halved while its mass remains constant, the net force acting on it will _________.