two horses are pulling a 325 kg wagon, initially at rest. The horses exert 250 N and 178 N forward forces, respectively. Ignoring friction,

Question

two horses are pulling a 325 kg wagon, initially at rest. The horses exert 250 N and 178 N forward forces, respectively. Ignoring friction, how fast is the wagon moving 3.50 s later?

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RuslanHeatt 3 years 2021-08-02T00:53:02+00:00 1 Answers 42 views 0

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  1. Orla
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    2021-08-02T00:54:42+00:00
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    Answer:

    AFter 3.5 s, the wagon is moving at:   4.62\,\,\frac{m}{s}

    Explanation:

    Let’s start by finding first the net force on the wagon, and from there the wagon’s acceleration (using Newton’s 2nd Law):

    Net force = 250 N + 178 N = 428 N

    Therefore, the acceleration from Newton’s 2nd Law is:

    F=m\,*\,a\\a = \frac{F}{m} \\a= \frac{428}{325}\, \frac{m}{s^2} \\a\approx 1.32 \,\,\frac{m}{s^2}

    So now we apply this acceleration to the kinematic expression for velocity in an object moving under constant acceleration:

    v_f=v_i+a\,*\,t\\v_f=0+1.32\,*\,3.5\,\,\frac{m}{s} \\v_f=4.62\,\,\frac{m}{s}

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