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27 December, 21:05

A student pushes a 2.85 kg cart causing it to accelerate at a rate of 4.9 m/s squared. What amount of force must the student have used? (2 sig digs)

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  1. 27 December, 23:05
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    In order to find the force (F), you would have to use the formula for it:

    F=ma

    where m is mass and a is acceleration.

    In the problem, the mass is 2.85kg and the acceleration is 4.9m/s^2.

    Therefore,

    F=2.85kg (4.9m/s^2)

    F=13.965kg (m/s^2)

    Since N=kg (m/s^2)

    F=13.965N

    And because the problem requires that we use only 2 significant figures,

    F=13N

    Therefore, the student must exert 13N of force.
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