If an object with a mass of # 3kg # changes speed from #5m/s# to # 9m/s#, by how much does its kinetic energy change?

1 Answer

Answer:

#Delta KE=84" "#Joules

Explanation:

Given data:
#m=3" "#kg
#v_i=5" "#m/sec
#v_f=9" "#m/sec

#DeltaKE=KE_f-KE_i#

#DeltaKE=1/2m*v_f^2-1/2m*v_i^2#

#DeltaKE=1/2m*(v_f^2-v_i^2)#

#DeltaKE=1/2(3)*(9^2-5^2)#

#DeltaKE=1/2(3)*(81-25)#

#DeltaKE=1/2(3)*(56)#

#Delta KE=84" "#Joules

God bless....I hope the explanation is useful.