Question

An object free falls $15m$ from the top of a ladder. Select the graph that best describes the following quantities during the fall. The kinetic energy of the object.

• A. A
• B. B
• C. C
• D. D
• E. E

Answer 1

Answer: (D)

D

The kinetic energy of an object of mass $m$ and having velocity $v$ is given by ,

$K=1/2m{v}^2$

or $K\propto v^2$

As the object falls down its velocity increases due to gravitational acceleration, hence the kinetic energy increases (exponentially) , by the given relation, which is best shown in graph $D$