# What is the kinetic energy of an object with a mass of #2 kg# that has been in freefall for #7 s#?

##### 1 Answer

Mar 11, 2018

#### Answer:

#### Explanation:

Here we can solve the problem in three ways.

- Calculate the velocity after
#7s# ,it will be#v=9.8×7=68.6 ms^-1#

So,kinetic energy will be

2 . Find how much the object has come down in

So,gain in kinetic energy = loss of potential energy=

3 . Here work done by gravitational force in bringing the object by distance