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A 2.80 kg mass is dropped from a height of 4.50 m. Find its potential energy (PE) when it is 3.00 m above the ground.

Question

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## Answers ( )

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Answer : 41.2 J

Explanation

The energy that the ball had instantaneously prior to being dropped was Potential Energy (EP) only and gravitational potential energy is calculated as Ep = mgh = (2.80)(9.81)(4.50) = 123.606 Joules.

Because no outside energy was added and no work was done, the energy instantaneously prior to being dropped is equal to the energy when the mass is 3 m above the ground only at that point, the energy consists of two parts, gravitational Potential Energy (EP) and Kinetic Energy (EK). So, considering the point just prior to the drop as point 1 and the point 3 m above the ground as point 2, we can say:

EP1 = EP2 + EK2

so EK2 = EP1 – EP2

and EP2 = (2.80)(9.81)(3.00) = 82.404

So EK2 = 123.606 – 82.404 = 41.2 Joules

Answer:PE = 82.32J

Explanation:PE = m*g*h

PE = 2.80kg*9.8m/s²*3m

PE = 82.32J