Question

You are holding a 1 kg rock and standing at the top of a cliff. You drop the rock off the cliff and it falls a distance 10 m. In this problem, you can ignore air resistance.
What is the change in the kinetic energy of the rock as it falls that distance?

Answer 1

Answer:

98J

Explanation:

Given that the mass of the rock m=1kg, the height =10m and we know that gravitational force is $g=9.8N/kg$.

Change in kinetic energy  happens when the initial potential energy at rest is converted into Kinetic energy as:

$\bigtriangleup KE=\bigtriangleup mgh\\\\=1kg\times 9.8\times10m\\\\=98J$

Hence, the change in kinetic energy of the rock is 98J