catie111102 catie111102

13-01-2017
Physics

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if a car has a kinetic energy of 400 J at 20m/s what.is the cars kinetic energy in kJ at a speed of 5 m/s

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MissPhiladelphia MissPhiladelphia

20-01-2017

Kinetic energy is an expression of the fact that a moving object can do work on anything it hits; it quantifies the amount of work the object could do as a result of its motion. It can be calculated as:

KE = mv^2 /2

We calculate the problem as follows:

KE = mv^2 /2

400 = m(20)^2 / 2

m = 2 kg

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