Question

The formula for kinetic energy is KE = m • v2. In this formula, KE stands for kinetic energy (in joules), m stands for mass (in kilograms), and v2 stands for speed squared, or the speed multiplied by itself. Calculate the kinetic energy of a 20-kg sled moving 28.0 m/s. ✏️Show your work in the space to the right. (Double click the box to edit it). To check your answer, set the height to 40 m and the mass to 20 kg. Click Play and wait until the sled gets to the bottom.

Answer 1

`K.E = 7840J`

Step-by-step explanation:

Given

`Mass(m) = 20kg`

`Velocity(v) = 28.0m/s`

Required

Determine the kinetic energy

The kinetic energy formula as presented in the question, is incorrect.

The right formula is:

`K.E = (1)/(2) mv^2`

Substitute 20 for m and 28.0 for v

`K.E = (1)/(2) * 20 * 28^2`

`K.E = 10 * 28^2`

`K.E = 10 * 784`

`K.E = 7840J`

Hence, the kinetic energy is 7840 joules