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Kisachek [45]
3 years ago
5

A bob of mass of 0.18 kilograms is released from a height of 45 meters above the ground level. What is the value of the kinetic

energy gained by the bob at the ground level?
250 joules
51 joules
79 joules
8.1 joules
Chemistry
1 answer:
Drupady [299]3 years ago
8 0

We can assume that all<span> gravitational potential energy is converted into kinetic energy of the object.</span><span>

<span>Hence, </span>GPE = KE

Where GPE is gravitational Potential Energy (J) and KE is Kinetic Energy (J)

GPE = mgh

<span>Where, m is the mass of the object (kg), g is acceleration due to gravity (9.8 m s</span></span>⁻<span>²) and h is the height to the<span> object from ground (m).</span></span><span>

m = 0.18 kg
g = 9.8 m s</span>⁻²<span>
h = 45 m

Hence, 
       GPE = 0.18 kg x 9.8 m s</span>⁻² x 45 m<span>
                = 79.38 J
                ≈ 79 J

<span>Hence, </span>KE = GPE = 79 J

<span>Hence, the answer is '79 joules'.</span></span>

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