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A 3.00 kg toy falls off shelf from acheight of 10.0 m just before hitting the...

A 3.00 kg toy falls off shelf from acheight of 10.0 m just before hitting the groun. What will be its kinetic energy? Disregard air resistance g= 9.8m/s2
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Answer #1

Answer : 294 J

Explanation:

Given Information,

Mass ,m = 3 kg

height h= 10 m

g = 9.81 m/s2

When the toy is at height of 10 m, the total energy stored in the toy will be potential energy. (Kinetic energy = 0 , as there is no motion )

So Energy at height of 10 m = Potential Energy =  

=

=

When the toy falls, its energy is transforming from potential to kinetic.
So, when the height is 0, all the potential energy will be converted to kinetic energy (by law of conservation of Energy)

So, Kinetic Energy of the toy, just before hitting the floor will be equal to the potential energy of the toy at height of 10 m ; which is equal to   294 J

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