Chapter 11, Problem 1STP

To determine

To Choose: The correct option.

Answer to Problem 1STP

Option D

Explanation of Solution

Given:

Mass of the box, $m=4.5\text{kg}$

Height of the book shelf, $h=1.5\text{m}$

Formula Used:

  $W=mgh$

Where, m is the mass, g is the gravitational acceleration and h is the height.

Calculations:

Work done = Gravitational potential energy:

  $\begin{array}{c}W=mgh\\ =\left(\text{4}\text{.5}\text{kg}\right)\left(9.8{\text{m/s}}^{\text{2}}\right)\left(1.5\text{m}\right)\\ \approx 66\text{J}\end{array}$

Conclusion:

Thus, correct option is D.