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`        a parashutist jumps from height 100 m. He wants to reach at ground with zero velocity. For this purpose he switches on a parachute propeller after falling freely for certain height. Given that after the parachute propeller is switched on total acceleration of the man varies with velocity as a=-2v, where v is the instantaneous velocity of the man . Find the time after  falling freely man should switch on parachute propeller for this purpose.`
5 years ago

Jishnu raj paraShar
11 Points
```							  a=-2v=> dv=-2dx=>v=2x=>4x^2 =2000-20x=>x^2 + 5x -500=0Solving , x=20100-20=80Using 2nd equation of motion,t = 4 s
```
3 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