Speed on an object given F and Ek....

[talknerdy2me]

Homework Statement

The kinetic energy of a 20N object is 5.00 x 10^2 J. What is the speed?

Homework Equations

Ek= 1/2 mv^2
and *i think*
F=mg

The Attempt at a Solution

F=mg
m=F/g
m=20N/9.81 m/s^2
m= 2.038 kg Ek= 1/2 mv^2
v=sq. root 2Ek/m
v=sq. root 2(5.00 x 10^2 J)/2.038 kg
v= 490 m/sIs this correct or do i need Jesus? lol

 

[kuruman]

Is this correct or do i need Jesus? lol

You don't need Jesus, you need to take the square root, lol².

 

[talknerdy2me]

oh duh! ok so ... 22. 135 m/s?

 

[kuruman]

Yup.