A boulder with mass 2500 kg falls from a ledge 200 m above the ground. If mechanical energy is conserved what is the speed of the boulder just before it hits the ground?
As mechanical energy is conserved the total energy in the boulder which is the sum of the potential and the kinetic energy is the same throughout its motion.
On the ledge 200 m above the ground, the boulder has no kinetic energy and its potential energy is given as m*g*h...
(The entire section contains 144 words.)
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