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31 January, 02:58

Find the kinetic of a 0.1 kilogram toy truck moving at a speed of 1.1 meters per second

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  1. 31 January, 03:27
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    KE = kinetic energy

    PE = potential energy

    GPE = gravitational potential energy

    energy is always measured in Joules (J)

    KE = (0.5) times the mass times the velocity^2

    square the velocity first

    Mass = (KE x 2) / v^2

    square the velocity first, then double the kinetic energy, then divide

    mass is measured in kg

    velocity = sqrt (KE x 2 / m)

    velocity can be called speed, like in the the second problem

    remember to find the square root after you double the KE and divide that by the mass.

    for example: if after you doubled KE and divided it by the mass you got sqrt (20), the answer would be about 4.47

    GPE = mass x gravitational pull (about 9.8 m/s^2 on earth) x height

    height = (PE) / (g x m)

    do g x m first

    So for question 1:

    KE = (0.5) 0.1 x 1.1^2

    always square the velocity first:

    KE = (0.5) 0.1 x 1.21

    KE = 0.0605

    so if you rounded it to the nearest hundreths you would get KE = 0.06 J

    don't forget the unit of energy is in Joules
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