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April 20, 2014

April 20, 2014

Posted by **Bob** on Saturday, October 13, 2012 at 1:02am.

a) What constant force must Bob exert on the rock to throw it with this speed?

b)If Bob is standing on frictionless ice, what is his recoil speed after releasing the rock?

- physics 100 -
**drwls**, Saturday, October 13, 2012 at 4:55amYou need to provide dimensions with your numbers.

- physics 100 -
**Elena**, Saturday, October 13, 2012 at 11:18amm1=60 kg, m2=0.8 kg, v=26m/s, s=1 m

(a). a=v²/2s =26²/2•1=338 m/s²

F=m1•a=60•338=20280 N (inhumanly large force... I believe that velocity has to be 2.6 m/s .... check your given data)

(b)The law of conservation of linear momentum

0= m1•v1-m2•v2

v1= m2•v2/m1= 0.8•26/60=0.347 m/s

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