Questions: (a) Using kinematics, find the final speed of the ball before it strikes the ground. (b) Using the law of conservation of energy, find the final speed of the ball before it strikes the ground. (c) Compare the two values obtained using the above two methods and conjecture one the importance of using the law of conservation of energy

Two 3.0 g bullets are fired with speeds of 40.0 m/s and 80.0 m/s respectively. What are their kinetic energies? Which bullet has more kinetic energy? What is the ratio of their kinetic energies?

QUESTION 7 Which of the following has the greatest kinetic energy? O a. A ball thrown at 15 m/s with a mass of 2 kg. O b. A ball rolled at 2 m/s with a mass of 15 kg. OC. A ball dropped at 0 m/s from a height of 1 meter with a mass of 1 kg. Od. A ball tossed at 5 m/s with a mass of 8 kg QUESTION 8 What quadrant will the resultant vector for the following forces? F1=250N in positive x axis, F2=300N (154 degree counterclockwise) Quadrant I (+x, +y) b. Quadrant II (-x, +y) a. C. Quadrant III (-x, -y) Quadrant IV (+x, -y) d. QUESTION 9 What is power? a. Gathering the energy to finish this lab exam. Ob. A conservative quantity intrinsic to the object. OC. A force x a distance. Od. A force x a distance per unit time

The first car has twice the mass of a second car, but only half as much kinetic energy. When both cars increase their speed by 12 m/s, they then have the same kinetic energy. a)  What were the original speeds of the two cars?