Question

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

2. What is the kinetic energy of an object with a velocity of 5m / s and a mass of 5kg
Helppppp!

Answer 1

Step-by-step explanation:

The formula for KE is

`KE=(1)/(2)mv^2` and we fill in to solve for KE:

`KE=(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=(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)