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20 August, 12:34

8. A car moving at 35 m/s has 675 joules of KE. What is the mass of the car?

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  1. 20 August, 14:18
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    Kinetic energy is the energy possessed by a body in motion while potential energy is the energy of a body at rest.

    Kinetic energy is given by E=1/2MV² where M is the mass of the body while V is the velocity of the body.

    To get mass we can use the formula M = 2 Ek/V² (Making M the subject)

    hence mass = (2 * 675) : 35²

    = 1.102 kg
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