Posted by **Abby** on Friday, March 9, 2007 at 2:39pm.

1)Two balls having the same mass of 1 kg roll toward each other, each moving at the same speed of 1 m/s. What is the combinded momentum?

Would it be 0 kg m/s

2)A 30 kg girl and a 25kg boy face each other on friction free roller blades. The girl pushes the boy who moves away at 1 m/s. The girls speed is?

Would it be .45

3)The power extended when a 10 N barbell is raised 2.0 m in 2 s is _____ watts

would it be 40?

4)Car A travels for times as fast as Car B. When braking to a stop Car A skids____ times as far as car B.

16?

(1) yes

(2) no. 30*Vgirl = -25*Vboy

Solve for Vgirl when Vboy = 1

(3) no. DIVIDE the work by the time

(4) yes. 4^2 = 16 Do you know why the skid is proportional to the square of speed? It has to do with kinetic energy

- Science Check -
**jeremy**, Tuesday, August 19, 2008 at 2:23pm
would it be 55

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