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given :
m=900kg
v=30m/s
We know that
KE=1/2 mv^2
=) KE = 1/2 900(30)^2
=) KE = 1/2 900*900
=) KE = 1/2 * 810000
=) KE = 810000/2
=) KE = 4,05000J
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