# A force F1 acts on a particle so as to accelerate it from rest to a velocity v. The force F1 is than replaced by F2which decelerates it to rest.(a) F1 must be equal to F2 (b) F1 may be equal to F2 (c) F1 must be unequal to F2 (d) None of these

Aman Bansal
592 Points
11 years ago

Dear Jeet,

Even a very small force can accelerate an object at rest, but for smaller force the acceleration will be smaller. F1 accelerates the body to velocity v, in some finite time which is not mentioned. Force is a vector quantity, and by convention F1 is positive as it is along the direction of motion of the object.

The other force F2 decelerates the object. Any finite force can decelerate a moving object. But this force opposes the direction of motion of the object so, it is negative.

Thus we conclude, the force F 1 and F 2 must be differentEven if they have same magnitude their direction will be opposite.

Cracking IIT just got more exciting,It s not just all about getting assistance from IITians, alongside Target Achievement and Rewards play an important role. ASKIITIANS has it all for you, wherein you get assistance only from IITians for your preparation and win by answering queries in the discussion forums. Reward points 5 + 15 for all those who upload their pic and download the ASKIITIANS Toolbar, just a simple  to download the toolbar….

So start the brain storming…. become a leader with Elite Expert League ASKIITIANS

Thanks

Aman Bansal