3. A 12.0 N force with fixed orientation does work on a particle as the particle moves through displacementm. What is the angle between the force and the displacement if the change in the particle's kinetic energy is 30 J?_______

4. A ballot box with mass m = 6.0 kg slides with speed v = 4.0 m/s across a frictionless floor in the positive direction of an x axis. The box explodes into two pieces. One piece, with mass m1 = 2.0 kg, moves in the positive direction of the x axis at v1 = 8.0 m/s. What is the velocity of the second piece, with mass m2 ? _______m/s.

3. A 12.0 N force with fixed orientation does work on a particle as the particle moves through displacementm. What is the angle between the force and the displacement if the change in the particle's kinetic energy is 30 J?_______

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