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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.

Sagot :

Kinetic Energy

[tex]____________________________________[/tex]

A 7-kg wooden ball 15 cm in radius is rolling at a speed of 3m/s. Find the total kinetic energy.

Given:

  • Mass - 7 kg
  • Velocity - 3 m/s
  • Radius - 15 cm

Answer & Solution:

[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;)