Question

An $800g$ ball is pulled up a slope as shown in the diagram. Calculate the potential energy it gains.

• A. $1.96J$
• B. $1.568J$
• C. $7.84J$
• D. $1.225J$

Answer 1

The correct option is B

$1.568J$

Step 1: Given data.

Mass of the ball m$=800g=0.8kg$

Height to which the ball is raised h$=20cm=0.2m$

Step 2: To find the potential energy.

We know that, Potential energy $P.E=mgh$ where, m is mass; g is the acceleration due to gravity; h is height.

$P.E=0.8kg\times 9.8m{s}^{-2}\times 0.2m$

$P.E=1.568J$.

Hence, option B is correct.