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Radda [10]
3 years ago
12

A lemon with mass 0.3 kg falls out of a tree from a height of 1.8 m. How much mechanical energy does the lemon have just before

it hits the ground? (Assume there is no air resistance.)
Physics
2 answers:
MArishka [77]3 years ago
5 0

The answer to your question is 5.3 J

Zina [86]3 years ago
3 0
Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. It can either be kinetics or potential. In this problem you know it starting position so you can calculate it's potential energy (PE):

<span>PE=mass∗gravity∗height=0.3kg∗9.8m/s2∗1.8m=?

</span>The answer will typically be given in joules:

1J=kg∗m2s2 Could be wrong...  But I believe it is 5.3...? as a final product.
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A whale swims due east for a distance of 6.9 km, turns around and goes due west for 1.8 km, and finally turns around again and h
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The question is incomplete. Here is the complete question:

A whale swims due east for a  distance of 6.9 km, turns around and  goes due west for 1.8 km and finally  turns around again and heads 3.7 km  due east.  (a) What is the total distance  traveled by the whale? (b) What are the  magnitude and direction of the displacement of the whale?

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The motion is along the east-west line.

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(a)

Distance traveled by the whale is equal to the sum of the lengths of all the distances traveled. Therefore,

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(b)

Displacement of the whale is given by considering the sign of each of the individual displacements. Therefore,

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The answer is positive. So, the direction is due east.

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