). An object of mass 40 kg is raised to a height of 5 m above th
ground. What is its potential energy? If the object is allowed
fall, find its kinetic energy when it is half-way down.
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Explanation:
pe=mgh
PE=40.10.5
pe=2000j
from Newton's 3rd eq
v^2=u^2+2as
=2.10.2.5
=50m/s
ke=1/2mv^2
=1/2.40.50.50
=100000j
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