If an object with a mass of #2 kg # changes speed from #2 m/s# to # 5m/s#, by how much does its kinetic energy change?

1 Answer
Jan 6, 2017

Answer:

#11J#

Explanation:

Kinetic energy is calculate dby the formula#" "KE=1/2mv^2#

so in this case

#m=2 kg,v_1=2 ms^(-1),v_2=5ms^(-1)#

#KE_(1)=1/2xx2xx2^2=4 J#

#KE_2=1/2xx2xx5^2=25 J#

#Delta KE=KE_2-KE_1=25-4=11 J#