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trunk and the floor is 0.400. A 400 N student pushes a 500 N trunk a distance of 8.00 m along a straight line, by applying a constant 600 N force directed 30 degrees below the horizontal. The initial speed of the trunk is 2.00 m/s and the coefficient of kinetic friction between the (N) Efy=0 Soosin 300 NE 4 SDN 30 1. The work which the student does on the trunk is equal to A. 3.20 kJ. B. 2.77 kl. C. 4.80 kJ. D. 4.16 kJ. E. 4.00 kJ. 2. The work done on the trunk by kinetic friction is equal to A. - 2.56 kl. B. - 6.40 kJ. C. - 1.60 kJ. D. -640 J. E. - 3.26 kJ. 3. The final kinetic energy of the trunk is equal to A. zero. B. 1.60 kJ. C. 1.70 kJ. D. 0.102 ki. E. 4.16 kl. 2
A student builds a miniature cannon, using an initially compressed spring to launch a 200 gram ball into projectile motion The ball starts out at rest, pressed against (but not attached to the spring, initially the spring is compressed by 5.00 cm. The stiffness constant of the spring is 1000 N/m. As the ball rubs against the inner wall of the cannon, a constant 0.600 N frictional force opposes the ball's motion. In the four questions on this page, consider the period of time during which the ball slides 20.0 cm to its exit from the cannon 20.0 cm 5.00 en 0000 60.0° 4. The work done on the ball by the force of gravity equals A. - 0.1961. B. - 392 J. C. 1961. D. -0.339). E. -0.392. 5. The work done on the ball by the elastic spring force equals A. 25.01. B. 1.25). C. 12.5 kJ. D. 2.50 J. E. - 25.0). 6. The work done on the ball by the force of friction equals A. 0.120. B. - 12.01. C. - 0.235 J. D. 12.01. E. - 0.120. 7. The ball exits the cannon with a speed of A. 0.0889 m/s. B. 3.54 m/s. C. 2.81 m/s. D. 3.36 m/s. E. 2.72 m/s. 3