# What is the kinetic energy of an object with a mass of # 5 kg# that has been in freefall for # 2 s#?

##### 2 Answers

960.4 J

#### Explanation:

The formula of Kinetic energy is

We know mass, so lets find velocity. It is given that it has been falling for two seconds. So its velocity

Plugging it into the equation, if it has been falling for 2 seconds, then its velocity is

Now since we have velocity, we can find Kinetic energy by simply putting the values of mass and velocity in the first equation

K.E.=

#### Explanation:

Well, kinetic energy is defined through the equation,

#m# is the mass of the object in kilograms

#v# is the velocity of the object in meters per second

The velocity of the free-fall object is defined through the equation,

#u# is the initial velocity

#a# is the acceleration of the object

#t# is the time in seconds

In this case,

If the object was dropped from something, then

Therefore, the kinetic energy is: