If the change in momentum with respect ot time is zero then
Correct answer: C. Momentum is constant
- A. Some force acts
- B. Momentum is zero
- C. Momentum is constant
- D. Force changes
Explanation
The correct answer is that the momentum is constant. The rate of change of momentum with respect to time is equal to the force acting on the object according to Newton's second law. If this rate of change is zero, it means that no net force is acting on the object, thus the momentum remains constant. Option A is incorrect because if a force acts, it would cause a change in momentum. Option B incorrectly assumes that zero change in momentum implies zero momentum, which is not necessarily true. Option D is incorrect because a changing force would imply a changing momentum.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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