Physics · The potential energy of a spring, conservation of mechanical energy, conservative and non-conservative forces
A body is dropped from a certain height from the ground. When it is halfway down
A body is dropped from a certain height from the ground. When it is halfway down, it possess,
- A. Only K.E.
- B. Both K.E. and P.E.
- C. only P.E.
- D. zero energy
Step-by-step solution
When a body is dropped, it has initial potential energy (P.E. = mgh) and zero kinetic energy (K.E.). As it falls, its height decreases, so P.E. decreases while K.E. increases due to conservation of mechanical energy. At halfway down, height = h/2, so P.E. = mgh/2. Since total energy is conserved, K.E. = total energy - P.E. = mgh - mgh/2 = mgh/2. Thus, the body possesses both K.E. and P.E.
Related MCQs
- Which quantity of a two particles system depend only on the separation between the two particles?…
- A spring is kept compressed by a toy car of mass On releasing the car it moves with a speed of So, the elastic potential energy of the sprin…
- A single conservative force \) acts on a particle that moves along the x-axis. The potential energy \) is =20+(x-2)^{2} \) where is in meter…
- A wire suspended vertically from one of its ends is stretched by attaching a weight of to the lower end. The weight stretches the wire by 1 …
- Assertion Graph between potential energy of a spring versus the extension or compression of the spring is a straight line Reason Potential e…