If an object with a mass of #12 kg # changes speed from #3 m/s# to #1m/s#, by how much does its kinetic energy change?

1 Answer
Harish Chandra Rajpoot
Jun 28, 2018

decrease by #48\ J#

Explanation:

Change in kinetic energy of an object of mass #m=12# kg due to change in speed from #v_1=3m/s# to #v_2=1m/s#

#=1/2mv_2^2-1/2mv_1^2#

#=1/2(12)3^2-1/2(12)1^2#

#=-48\ J#

The above negative value shows that the kinetic energy of object decrease by #48\ J#

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