2. A ball of mass 500 g is dropped from a height of 7 m and it bounces back to a height of 5 m after hitting the ground. a. Calculate the G. P.E before the ball before it hits the ground
b. Explain the energy transformation from when the ball is dropped till the ball hits the ground
c. Calculate the G. P.E after the ball bounces back.
d. How much energy is wasted?
At a certain height the reaches a velocity of 8 m/s before it hits the ground
e. Calculate the K. E.
f. Calculate the work done when the ball reaches that speed.

9. an object is moved from the outdoors, which is at a temperature of 100 ºf, to a room at a temperature of 70 º f. what happens to the object when it’s placed in the room with a lower temperature? the object gives off more energy than it absorbs until it reaches a new lower thermal equilibrium where the amount of energy absorbed and given off is the same. the object gives off the same amount of energy as it absorbs until it reaches a new lower thermal equilibrium where the amount of energy given off is greater than the amount of energy it absorbs. the object gives off more energy than it absorbs until it reaches a new higher thermal equilibrium where the amount of energy absorbed and given off is the same. the object absorbs more energy than it gives off until it reaches a new lower thermal equilibrium where the amount of energy absorbed and given off is the same.

The temperature of a solution can change the solubility of a substance. the chart shows the solubility of the same solute at different temperatures in water. based on the chart, which solution was at the optimal temperature to allow for the greatest solubility? w x y z

Physics pl 12)a body goes from p to q with a velocity of 10 m/s and comes back from q to p with a velocity of 20 m/s. what is the average velocity of the body during the entire trip? a)0 m/s b)13 m/s c)10 m/s d)15 m/s