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A 7-kg wooden ball 15 cm in radius is rolling at a speed of 3m/s. Find the total kinetic energy.
[tex]\large\sf KE=\frac{1}{2}mv^2[/tex]
[tex]\large\sf KE=\frac{1}{2}(7 \: kg)(3 \: m/s)^2[/tex]
[tex]\large\sf KE=\frac{1}{2}(7 \: kg)(9 \: m/s)[/tex]
[tex]\large\sf KE=\frac{1}{2} \: (63 \: kg.m/s)[/tex]
[tex]\large\sf KE=31.5 \: kg.m/s[/tex]
[tex]\large\sf KE=\boxed{\bold{\red{31.5 \: J}}}[/tex]
[tex]\sf\therefore The \: kinetic \: energy \: is \: \boxed{\bold{31.5 \: J}}[/tex]
#staysmart;)