Question

Find the kinetic energy of a ball of mass $200g$ moving at a speed of $20cm{s}^{-1}$.

• A. $0.4J$
• B. $0.004J$
• C. $0.001J$
• D. $0.1J$

Answer 1

The correct option is B $0.004J$

$K.E=\frac{1}{2}m{v}^2$

$=\frac{1}{2}\times 0.2\times 20\times 20\times {10}^{-4}$

$=0.004J$