A 7.0 kg bowling ball moves at 2.50 m/s. How fast must a 2.20 g Ping-Pong ball move so that the two balls have the same kinetic energy?

A 5.0 kg box moves up a ramp with some initial speed. It reaches a vertical height of 3.0 m before momentarily coming to rest. If 100 J of thermal energy is created in the process. Use g = 10 m/s2. Match the answers with questions.

Timmy is sat down in class, looking around the room. He notices a water bottle on a desk next to him and thinks to himself that since the water bottle is on the desk it must not have kinetic energy. Is he right yes, or no? Explain?

An airplane of mass 4500 kg is cruising at a speed of 49.0 m/s at an altitude of 175 m. What is its total mechanical energy ?  Show solution and choose from the choices below:       2.27 × 10^8 J       6.91 × 10^7 J       5.26 × 10^7 J       3.91 × 10^7 J       1.31 × 10^7 J

A 1.0 kg cart is sliding to the right on a frictionless surface with speed 2 m/s. It collides head-on and sticks to a 0.5 kg cart that is sliding to the left with speed 4 m/s. What is the kinetic energy of the combined carts after the collision? (Hint: Make a table!) A.6 J B.0 J C.2 J D.4 J

7. A 0.15 kg baseball is tossed horizontally from the top of a 27 m high cliff, and when it reaches the ground it lands with a velocity of 27 m/s. Use conservation of energy to find the initial velocity of the baseball (i.e. the speed at which it was tossed).

A 25 kg boy is swinging on a 2.5 m long chain. He swings up to a 50° angle. What is the final speed when the boy is at the bottom of his swing.

At a carnival, you can try to ring a bell by striking a target with a 9.10-kg hammer. In response, a 0.410- kg metal piece is sent upward toward the bell, which is 5.05 m above. Suppose that 22.0% of the hammer's kinetic energy is used to do the work of sending the metal piece upward. How fast must the hammer be moving when it strikes the target so that the bell just barely rings?

Calculate the kinetic energy of a 300 g baseball thrown at a velocity of 44 m/s. NAS 440 J 290 J 580 J 510 J 13.2 J

A 72 kg skiier goes down a 45 meter tall hill and reaches 26 m/s at the bottom of the hill.  What is the percentage of the total energy that was lost to friction?    A.17%    B.23%   C.52%    D.46%   E,31%