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April 21, 2014

April 21, 2014

Posted by **Lui** on Wednesday, May 16, 2012 at 6:43pm.

- Momentum -
**Elena**, Thursday, May 17, 2012 at 6:55amm1 =4.4•10^-3 kg, m2 = 21.3•10^-3 kg, h =1.3 m, L= 2.4 m., v1 =?

m1 •v1 = (m1+m2) •v,

v= m1 •v1 /(m1 + m2) .

h =g•t²/2 => t = sqrt(2•h/g)

L= v•t = v• sqrt(2•h/g),

v =L/sqrt(2•h/g),

m1 •v1 /(m1 + m2) = L/sqrt(2•h/g).

v1= L•(m1 + m2)/m1• sqrt(2•h/g) =

= 2.4•(4.4•10^-3+21.3•10^-3)/( 4.4•10^-3)•sqrt(2•1.3/9.8) =

= 2.4•2.57•10^-2/(4.4•10^-3)•0.515 =27.22 m/s.

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