A stone of mass m is dropped from height h. Ignoring air resistance, its kinetic energy just before hitting the ground is:
By conservation of mechanical energy, the entire loss in gravitational potential energy of the stone as it falls through height h is converted into kinetic energy, since air resistance is ignored. The potential energy lost is \(mgh\), so the kinetic energy just before hitting the ground equals mgh.
Important Questions from Work Power and Energy
A boy raises a box with a weight of 120 N from a height of 2 m. The work done by him is ________.
While releasing the arrow from a stretched bow, the Potential Energy of the bow is converted into?
Which is the main source of almost all energy on Earth?
Area under constant velocity – time curve equals ________ of the object over a given time interval.
If a body of mass is m, linear momentum is p and kinetic energy is K, then which of the following expressions is true?
