Question

The work done against gravity in taking $10kg$ mass at $1m$ height in $1sec$ will be

• A. $49J$
• B. $98J$
• C. $196J$
• D. None of these

Answer 1

The correct option is B

$98J$

Step 1: Given information

Mass$=10Kg$

Height$=1m$

Time$=1sec$

Step 2: Explanation

When a body is raised to some height, the work is done against gravity since gravity acts in the opposite direction to the direction of motion.

Step 3: Calculate work done against gravity

Knows, $Workdone=Mass\times Gravity\times Height$

$$\begin{gathered} \Rightarrow Workdone=10\times 9.8\times 1 \\ \Rightarrow Workdone=98J \end{gathered}$$

Hence, the correct option is (B).