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`        A body falls freely under gravity.The distance travelled by it in the last second of its journey equals the distance travelled by it in the first three seconds.  the total time off all is(a) 5s   (b) 8s  (c) 12s  (d)  15s`
2 years ago

Piyush Kumar Behera
432 Points
```							The answer is 5 seconds..Distance travelled in first three seconds=s=1/2at2=1/2 * 10 *32=45mDistance travelled in nth second=u + g(2n-1)/2as the magnitude of last second is the magnitude of the total time taken.Distance travelled in nth second=Distance travelled in first three seconds=45m=>u + g(2n-1)/2=45as u=0=> g(2n-1)/2=45=> n=5so the last second is 5th second so the total time taken is 5 seconds.I Hope you understood the solution!!Please upvote the solution to encourage me..
```
2 years ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions