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