If an object with a mass of #12 kg # changes speed from #1 m/s# to #2 m/s#, by how much does its kinetic energy change?

1 Answer
Dec 10, 2015

Answer:

The kinetic energy increases by #6"J"#

Explanation:

The expression for kinetic energy is :

#KE=1/2mv^2#

The initial #KE# is :

#1/2xx12xx1=6"J"#

After the increase in speed this becomes:

#1/2xx12xx2=12"J"#

So you can see that the #KE# has increased from 6 to 12J which is an increase in 6J.