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Allisa [31]
3 years ago
13

How is speed determined?

Physics
1 answer:
enot [183]3 years ago
7 0

Speed equals distance divided by time (Speed=Distance/Time).

For example if it takes someone three minutes to go three miles their speed is one mile a minute.

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How much kinetic energy does an object have that is moving at a rate of 30 m/s and has a mass of 4000 kg ?
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Answer:

K = 1800 kJ

Explanation:

Given that,

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We need to find the kinetic energy of the object. The formula for the kinetic energy is given by :

K=\dfrac{1}{2}mv^2\\\\K=\dfrac{1}{2}\times 4000\times 30^2\\\\K=1800000\\\\or\\\\K=1800\ kJ

So, the required kinetic energy is equal to 1800 kJ.

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