JAMB - Physics (1979 - No. 33)
A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is?
a little above half of its initial energy
a little below half of its initial energy
a half of its initial energy
a little above its initial energy
a little below its initial energy
Vysvětlení
Energy for complete distance is twice the energy for half the distance