A 8-kg body has three times the kinetic energy of an 12-kg body. Calculate the ratio of the speeds of these bodies. V12

Notice how much an effect speed has on kinetic energy, due to its dependence on speed squared. The kinetic energy of the fast-moving baseball that you found in the previous step skip is about the same, even a little more, than the walking student, even though baseball has much less mass. This is because of the baseball's much greater speed. Here is another example that shows how speed greatly affects the kinetic energy. One type of rifle used by the military fires a bullet with a mass of 0.000356 kg that exits the rifle's barrel with a speed of 910 m/s. What is the bullet's kinetic energy (in J)?  ______J Again, notice how higher speed has a huge effect on kinetic energy. Let's try a few more examples of reasoning with kinetic energy. Two rocks are moving at the same speed. Rock #2 has    the mass of rock #1. The kinetic energy of rock #2 is then  ____________      the kinetic energy of rock #1. Two identical cars have the same mass. Car #2 is moving at    the speed of car #1. The…

A car with a mass of 1,500 kg is going straight ahead at a speed of 60 m/s. The brakes can supply a force of 9,500 N. Calculate: a) The kinetic energy of the car b) The distance it takes to stop the car.

A cannon ball is shot out of a cannon with a velocity of 120.0m/s. Calculate the angle the cannon is tilted if the cannon ball lands 1467.9 meters away?