Answer to Question #108944 in Mechanics | Relativity for John

Question

Calculating the momentum of a 2.0g feather moving at 3m/s?

Then the kinetic energy of the feather from problem 1 in joules

Answer 1

The momentum of a feather

$$p=mv=(0.002\:\rm kg)(3.0\:\rm m/s)=0.006 \:\rm kg\:m/s.$$

The kinetic energy of a feather

$$K=\frac{mv^2}{2}=\frac{(0.002\:\rm kg)(3.0\:\rm m/s)^2}{2}=0.009 \:\rm J.$$