Question

A block of wood of mass $250g$ is moving at a speed of $4m{s}^{-1}$. Find its K.E. in Joules.

• A. $4J$
• B. $2J$
• C. $1J$
• D. $10J$

Answer 1

The correct option is B $2J$

Kinetic energy$=\frac{1}{2}m{v}^2$

$=\frac{1}{2}\times \frac{1}{4}\times 4\times 4=2J$