How to Calculate the Mass of a Toy Car Using Kinetic Energy?

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To calculate the mass of a toy car using its kinetic energy, apply the formula for kinetic energy, Ek = (1/2)mv², where Ek is kinetic energy, m is mass, and v is velocity. Given that the toy car has a kinetic energy of 14.0 J and a constant velocity of 2.10 m/s, rearranging the formula allows for the calculation of mass. The term "eg" refers to gravitational potential energy, which is not needed for this calculation. By substituting the known values into the kinetic energy formula, the mass of the car can be determined. This method provides a straightforward approach to solving the problem.
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"A child's toy race car travels across the floor with a constant velocity of 2.10m/s. if the car possesses 14.0 j of kinetic energy, find the mass of the car."

How do i do this question? Am i supposed to use ek=eg or something else?
 
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Please define your notation. I can guess that ek means kinetic energy but I don't know what eg stands for!

You are told the speed of the car and the kinetic energy. Do you know th basic definition of kinetic energy Ek= (1/2)mv2?
 
eg stands for potential energy Mass*height*gravity
 
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