Question

purpose: this quiz will test your comprehension of the content from module 5. instructions: this quiz consists of 10 multiple - choice questions. this quiz doesnt have a time limit and you can retake it as many times as you would like. click on \take the quiz\ once you are ready to begin. question 4 1 pts neglecting air resistance, sammy smarts on a high ladder releases a ball that strikes the ground with 100 j of kinetic energy. if he were to instead throw the ball straight upward, it will soon reach the ground with a kinetic energy of less than 100 j. 100 j. more than 100 j. not enough information.

Explanation:

Step1: Consider conservation of mechanical energy

When the ball is released from the ladder, its initial potential energy is converted to kinetic energy on hitting the ground (neglecting air - resistance), and that kinetic energy is 100 J. When the ball is thrown upwards, it has an initial kinetic energy due to the throw in addition to its initial potential energy (same as in the first case).

Step2: Analyze final kinetic energy

As it moves up and then comes back down to the same height (the height of the ladder), the potential energy is the same as the initial situation. The extra initial kinetic energy from the throw is added to the energy that would have been there if it was just dropped. So the total kinetic energy when it reaches the ground is more than 100 J.

Answer:

more than 100 J.