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Lesson_3.2_Homework

Lesson_3.2_Homework - Lesson 3.2 Homework 1 A 2.0-kg box is...

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Lesson 3.2 Homework 1. A 2.0-kg box is raised to a height of 3.0 m by applying a vertical force of 50 N. Find (a) the work done by the applied force. (b) the work done by gravity (c) the gain in kinetic energy of the box. (d) the gain in potential energy of the box. 2. A box of mass 2.0 kg initially moving at 5.0 ms -1 is acted upon by a constant force of 25 N in the direction of motion. After some time the speed of the box is 22 ms -1 . Calculate the work done by the force on the box. 3. A spring gun has a spring with a force constant of 500 Nm -1 . If this gun is used to shoot a 25-g ball straight up by compressing the spring by 6 cm, find: (a) The initial kinetic energy of the ball. (b) The potential and kinetic energies at the highest point. (c) The height reached by the ball. 4. A 2-kg mass and a 5-kg mass are connected by a string that goes over a frictionless pulley. If the two masses are at the same height initially, find the speed of the system when the 5-kg block has fallen through 2.0 m.

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Lesson_3.2_Homework - Lesson 3.2 Homework 1 A 2.0-kg box is...

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