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A particle of mass 2.5 kg is moving at a speed of 12 m/s....

A particle of mass 2.5 kg is moving at a speed of 12 m/s. If a force of magnitude 10 N acts against it, find how long it takes to come to rest.

A.

1.5 s

B.

3.0 s

C.

4.0 s

D.

6.0 s

Correct answer is B

F=ma

10=2.5aa=4ms2

Since it is a retarding movement, then a=4ms2.

v=u+at;v=0ms1,u=12ms1

0=12+(4t)0=124t

4t=12t=3s