Question

1.What is the kinetic energy of an object with a velocity of 7m / s and a mass of 14kg

Answer 1

Answer:

Explanation:

The formula for KE is

$KE=\frac{1}{2}mv^2$ and we fill in to solve for KE:

$KE=\frac{1}{2}(14)(7.0)^2$ I used 2 significant digits in the velocity because 1 isn't accurate enough. Therefore, my answer will be rounded to 2 sig fig's:

KE = 340 J (rounded from 343). And we do the exact same thing in #2:

$KE=\frac{1}{2}(5.0)(5.0)^2$ (Used 2sig fig's for both the mass and the velocity) to get

KE = 63 J (rounded from 62.5)