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Chandan Das Grade: Upto college level
```        1.The length of the seconds hands of a clock is 1cm.The change in velocity in its tip is what?
2.A body starts moving with velocity u=10m/s.It experiences a retardation equal to 0.2v2 .Its velocity after 2s is what?```
7 years ago

147 Points
```										Dear Chandan das
given retardation = 0.2v2
or  -dv/dt =0.2v2
-dv/v2=0.2 dt
intigrate
1/V = 0.2t +c
now use initial condition  at t= o ,v=10 m/sec
so    c= 0.1
equation become
1/V = 0.2t  +0.1

so at t=2 sec
1/v = 0.4+0.1
v= 2 m/sec
Please feel free to post as many doubts on our discussion forum as you can.If you find any question Difficult to understand - post it here and we will get you the answer and detailed  solution very  quickly. We are all IITians and here to help you in your IIT JEE preparation.All the best. Regards,Askiitians ExpertsBadiuddin
```
7 years ago
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