Classical Mechanics
Kinetic Energy
A object initially at rest starts to fall freely. If air resistance is negligible, what is the object's kinetic energy after seconds?
The gravitational acceleration is
What is the kinetic energy of a object moving at
A car of mass is traveling at on a street that has a speed limit of The driver spots a police car and reduces its speed to match the speed limit. How much kinetic energy did the car lose?
A object, , travels at and a object, , travels at
Find the ratio .
Recently, a meteor impacted Russia. The estimate of the meteor's size was and it was estimated to have entered the earth's atmosphere at a speed of . What was the total kinetic energy of such a meteor as it entered the atmosphere?
Details and assumptions
- One ton is .