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A particle is moving in a straight line with initial velocity u and retardation av, where v is the velocity at any time t
[a] the particle will cover a total distance u/a 
[b] the particle will come to rest after 1/a 
[c] the particle will continue to move for a very long time 
[d] the velocity of the particle will become u/2 after time 1/a

 Solution:
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