Question

If a constant external force starts acting on a moving particle, then:

• A. The line of motion of the particle will keep changing
• B. The speed of the particle will keep changing
• C. The particle will keep moving
• D. All of the above are correct.

Answer 1

The correct option is B The speed of the particle will keep changing

If a constant force is applied to a moving object then it will produce acceleration or deceleration.

It depends on the direction of force applied to the moving object If there is acceleration or deceleration then there will always be a change in the speed of the object.

Speed may decrease or increase, it depends on the direction of the force.

So, the correct answer is B. Speed of the particle will keep changing.