Question

Choose the INCORRECT options:-

• A. If relative velocity of one object with respect to other is towards the line joining them, then they must collide.
• B. If relative velocity of one object with respect to other is towards the line joining them, then they may collide.
• C. A particle staring from rest under the action of constant acceleration must follow a straight line trajectory .
• D. Motion under constant magnitude acceleration can never result in a closed path trajectory with some area enclosed.

Answer 1

Answer: (C), (D)

A particle staring from rest under the action of constant acceleration must follow a straight line trajectory .
Motion under constant magnitude acceleration can never result in a closed path trajectory with some area enclosed.

If relative velocity of one object with respect to other is towards the line joining them, then they $may$ collide $provided$

the relative $acceleration$ of one object with respect to other is towards the line joining them or if it is $retardation$

then it should not change the direction of motion $before$ striking the other object.

C is correct because it will have only one-dimensional motion along the acceleration.

D is $incorrect$ because an $uniform$ circular motion contradicts it.