Question

How much energy is gained by a box of mass $20kg$ when a man

(iii) Raise the box by $0.5m$ in order to place it inside the bus? $(g=10m/s^2)$

Answer 1

Step 1: Given data:

Mass, $m=20kg$

Height, $h=0.5m$

$g=10m/s^2$

Step 2: Finding the energy gained by a box:

The energy gained by a box is potential energy.

$PE=mgh$, where $PE$ is potential energy, $m$ is mass and $h$ is height, $g$ is acceleration due to gravity.

$PE=20\times 10\times 0.5$

$=100J$

Hence, the energy gained by a box of mass $20kg$, when a man raise the box by $0.5m$ in order to place it inside the bus is $100J$.