Question

What is the kinetic energy of a 1.000 g bullet traveling at 1,000 m/s?

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Answer 1

Answer: B

Explanation:

The conventional units for Joules is defined with kilograms. We are given the mass of the bullet in grams. Using the conversion factor of 1kg = 1000g, we get that:

$1g*\frac{1kg}{1000g} =1*10^-^3kg$

Kinetic energy is defined to be:

$KE=\frac{1}{2} mv^2$

$KE=\frac{1}{2} (10^-^3kg)(1000m/s)^2$

$KE=500J=5*10^2J$