Question

Find the momentum on a 50 gram rock traveling at 30 m/s in kgm/s. Then find how much kinetic energy the same rock has in Joules.

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Answer 1

`p=1.5kgm/s\\K=22.50J`

Step-by-step explanation:

First of all the mass in in g and we need it in kg, so let's convert it.

`50g((1kg)/(1000g))=0.050kg`

Now we can proceed.

Find the momentum.

`p=m*v`

`p=(30m/s)(0.050kg)\\p=1.5kgm/s`

Now let's find the kinectic energy that this rock has in Joules.

`K=(1)/(2)mv^2`

`K=(1)/(2)(0.050kg)(30m/s)^2\\ K=(1)/(2)(0.050kg)(900m^2/s^2)\\ K=22.50J`