Question

A uniform force of $4N$ acts on a body of mass $8kg$ for a distance of $2.0m.$The kinetic energy acquired by the body is

• A. $8J$
• B. $64J$
• C. $4J$
• D. $16J$

Answer 1

The correct option is A

$8J$

Step 1: According to the question

Force act on a body $F=4N$

Mass of a body $m=8kg$

Distance covered by body $d=2m$

Step 2: Calculate the kinetic energy,

Work energy theorem

$$\begin{gathered} \Rightarrow W=∆K.E \\ \Rightarrow F\times d=K.E_f-0 \\ \Rightarrow 4\times 2=K.E_f \\ \Rightarrow K.E_f=8 \end{gathered}$$

Thus, we conclude that the kinetic energy acquired by the body is $K.E_f=8J$.

Hence, option A is the correct answer.