2 AP physics problems please?

Posted on 2015-11-20 06:10:00 in Physics by JORDAN

1.) How much work is done by the force of friction and by a person when the person is pulling a box 10 m at a constant speed of 7 m/s across a level floor? The mass of the box is 40 kg and coefficient of kinetic friction is 0.470.

2.) A 135 kg bomb lying in a field suddenly explodes into 3 pieces having respective masses of 20.0, 47.0 and 68.0 kg. The 20.0 kg piece is thrown horizontally North with an initial speed of 25.0 m/s; the 47.0 kg piece is thrown horizontally East with an initial speed of 40.0 m/s. Find (a) What is the net momentum of the bomb before the explosion? (b) How much is the net momentum of the 3 pieces after the explosion? (c) If the third piece flies off horizontally to the Southwest, what is its speed?

Thanks in advance.

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