A net force of 10 N moves a 3 kg object initially at rest a horizontal distance of 5 m directly in the direction the net force is acting. Hint: The first part of Example Problem 3 is similar to this problem. What is the initial kinetic energy (in J) of the object? (1A) What is work (in J) done on the object? (13) What is kinetic energy (in .I) of the object immediately when the force has moved it 5 m? (1C) What is the velocity (in m/s) of the object immediately when the force has moved it 5 m? A 10 kg block at rest at a height of 7 m above the ground slides down an incline to the ground. Assume there is no friction between the block and the incline, and assume the coefcient of friction between the block and the ground is u = 0.12. Hint: For help on this problem, watch the Example Problem 2 videos. (2A) What is the potential energy (in J) of the block at the top of the incline? (23) What is the potential energy (in J) of the block at the bottom of the incline? (2C) What is the kinetic energy (in J) of the block at the top of the incline? (2D) What is the kinetic energy (in J] of the block at the bottom of the incline? (2E) What is the velocity (in m/s) of the block at the bottom of the incline? Once the block is on the ground, what is the magnitude (in N) of the normal force on the block? (2F) What is the magnitude (in N) of the frictional force on the block once it reaches the ground? (See the video "Coefficient of Friction and the Force of Friction " in the Course Materials/Lecture/Work and Energy Lesson) (26) How far in meters does the block slide on the ground before it comes to rest? (See video "Example Problem 2 Part 4") A 10.2 kg weight hangs from a pulley as shown below, and an upward force on the rope (represented by the red arrow) raises the weight a distance of 8 cm (0.08 m) at a constant velocity. Image below by Csar Rincon. weight on pulley (3A) What is the change in potential energy (in J) of the block in being lifted? 7.9968J (SB) What is the upward force (in N) represented by the red arrow? 199.96 (3C) How far (in m) is the rope pulled upwards? .16 (3D) What is the work (in J) done by the upward force in lifting the block? 99.98 (3E) What is the mechanical advantage of the pulley? Since the mechanical advantage of the pulley is 2:1, the distance the rope is lifted is twice the distance the object is lifted