- #1

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An automobile traveling 25km/hour has kinetic energy equal to 1*10(6 power)J

all i know is KE=mass*km/hour

What is the mass of the car?

all i know is KE=mass*km/hour

What is the mass of the car?

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- Thread starter Lovely
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- #1

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all i know is KE=mass*km/hour

What is the mass of the car?

Last edited:

- #2

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[tex]E_{K}=\frac{1}{2}mv^{2}[/tex]

Isolate mass in this equation and substitute the information you have for the other variables. Remember that for kinetic energy to be in joules, mass must be in kilograms and velocity in meters per second.

- #3

Doc Al

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No, KE = [itex]1/2 m v^2[/itex]. (Lovely said:all i know is KE=mass*km/hour

- #4

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Lovely said:

all i know isKE=mass*km/hour

What is the mass of the car?

To add a little bit,the thing i underlined it is completely incorrect,because u have multiplied a unit with a physical quantity and got another physical quantity...That cannot be true...

Daniel.

- #5

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the equation is KE=1/2mv(squared)dextercioby said:To add a little bit,the thing i underlined it is completely incorrect,because u have multiplied a unit with a physical quantity and got another physical quantity...That cannot be true...

Daniel.

- #6

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If I take these steps will I be able to find the mass of the car?Doc Al said:No, KE = [itex]1/2 m v^2[/itex]. (Momentumis mass x speed; kinetic energy is a different thing altogether.) Be sure to use standard units: convert km/hour to m/s; mass will be in kg.

- #7

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Provided u work correctly,of course...

Daniel.

Daniel.

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