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Classical Mechanics
Level
1
An object is dropped from a certain height .
It is observed that it covers the last 6.2 m in 0.2 seconds
Find the height from which it is thrown .
The answer is 51.2.
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1 solution
Firstly the body should be dropped not thrown . we have u=0 g= 10m/s ^2 case 1 ; when body covers 6.2m let u=u , g=10m /s^2: s=6.2m:t=.2s now using second equation of motion we find u = 30m/s now for case 2 we have u=0 : g=10m/s^2:v=30m/s and now using third equation of motion we get s =45m now adding 45m and 6.2m we get 51.2m