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A 2 kilogram rabbit starts from rest and is moving at 6m/s after 3 seconds. What net force must be exerted on the rabbit (by the ground) to cause this change in speed?

Respuesta :

AL2006

The best way to handle this is to apply Newton's
second law of motion:

       Force = (mass) x (acceleration) .

But before we can do that, we need to figure out
the rabbit's acceleration.

       Acceleration  =  (change in speed) / (time for the change)

                                             =  (6 m/s)  /  (3 sec) 

                                             =  2 m/s² .

Now we have both of the numbers we need in order to apply Newtons law:

           Force = (mass) x (acceleration)

                     =   (2 kg) x (2 m/s²)

                     =        4 kg-m/s²      =    4 newtons . 

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