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physical science 9th

Science
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A horse is running 35 m/s when it (mass A 1000kg) runs into a pig (Mass B= 350 kg) that is standing still (V=0). If the horse is running at 20 m/s (Va2) how fast is the pig traveling at. (Vb2).

Mar 19th, 2015

Assuming Conservation of Momentum, we have that total momentum must be equal before and after the collision.

Momentum for a body is given by p = mv; where p is momentum, m is mass and v is velocity. Technically p and v are vectors with directions, but in this simple example we can assume the horse and pig move in the same direction, so we don't need to overcomplicate things!

So momentum before = momentum after:

mv (horse before) + mv (pig before) = mv (horse after) + mv (pig after)

1000 x 35 + 350 x 0 = 1000 x 20 + 350 x Vb2

35,000 = 20,000 + 350Vb2

Vb2 = 15,000 / 350

= 42.86 m/s

Mar 19th, 2015

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