Ball A of mas 2m and ball B of mass m fall from the height of h and 3h respectively. What is the ratio of the maximum momentum of A to that of B?
thanks a lot ...
physics....
2009-03-21 3:57 am
回答 (1)
2009-03-21 6:34 am
✔ 最佳答案
For ball A:2mgh = 1/2 ( 2m )v^2
=> v = sqrt( 2gh )
=> max momentum = 2m( sqrt( 2gh )) = m( sqrt( 8gh ))
For ball B:
mg( 3h ) = 1/2mv^2
=> v = sqrt( 6gh )
=> max momentum = m( sqrt( 6gh))
Ratio of A:B = sqrt( 8 ) : sqrt( 6 ) = 2 : sqrt( 3 )
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