Question

A body of mass $2$ kg is dropped from a height of $1$ m. Its kinetic energy as it reaches the ground is

• A. $19.6$ J
• B. $19.6$ N
• C. $19.6$ kg
• D. $19.6$ m

Answer 1

The correct option is A

$19.6$ J

Step 1 : Given data

mass = $2$ kg

height = $1$ m

g= $9.8\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s^2$}\right.$

Step 2 : Calculating kinetic energy

Potential energy = mgh

P.E = $2\times 9.8\times 1$

P.E = $19.6$ J

Potential energy at highest point will be equal to kinetic energy at lowest point.

So, kinetic energy is $19.6$ J.

Hence, option A is correct.