You let go of a 0.3kg ball from a height of 2m. When the ball bounces off the ground, it loses 15% of its energy as sound. What is the velocity of the ball right before it hits the ground? What is the velocity of the ball right after it hits the ground?  How much energy does the ball lose during the

The work done by you as you stretch a massless spring is   a. the change in the potential energy of the spring     b. the negative of the work done by the spring   c. parts (a) and (b)   d. none of the above     QUESTION  You stretch a spring from an already stretched position. Which of the following statements is true?   a. The work you do is negative.     b. The work done by the spring is positive.     c. The change in the spring’s potential energy is negative.     d. None of the above are true.      QUESTION  The work done by a horizontal spring as it is being compressed from its unstretched position is   a. positive     b. negative     c. either positive or negative, depending on where you start   d. depends on how fast you are moving       e. none of the above because work is a scalar that cannot be referred to as positive or negative      QUESTION…

1. C, d, and e

A springy ball is dropped and allowed to bounce.  Which of the following represents the correct order of energy changes as it bounces?   Question 15 options:   gravitational - elastic - gravitational - elastic   gravitational - kinetic - elastic - kinetic - gravitational   gravitational - kinetic - gravitational - kinetic   kinetic - elastic - kinetic - elastic