Question

An object has a kinetic energy of 8.8J and a mass of 450g. How fast is the object moving?

Answer 1

Step-by-step explanation:

The formula for KE is

`KE=(1)/(2)mv^2` We have everything we need to solve for the velocity, but we first have to convert the mass from grams to kg:

450 g = .450 kg

`8.8=(1)/(2)(.450)v^2` and we'll rearrange that and solve it for v before we do any math:

`v=\sqrt{(2(8.8))/(.450) }` so

v = 6.3 m/s rounded to the correct number of sig fig's