Question

When some force is applied on a body of mass $2kg$, its velocity changes from 10 m/s to 20 m/s. The work done is .

• A. $200J$
• B. $100J$
• C. $300J$

Answer 1

The correct option is C $300J$

According to the Work-Energy theorem,
Work done = Change in Kinetic Energy
$W=\frac{1}{2}\times m(v_f^2-v_i^2)$
$⟹W=\frac{1}{2}\times m({20}^2-{10}^2)=\frac{1}{2}\times 2(400-100)=300J$