Question

A 10 kg rock is suspended 320 m above the ground.

What is its kinetic energy before it is released?

K.E. =

0 J
1.6 x 104 J
3.1 x 107 J
1.0 x 107 J

Answer 1

As object is not in the motion, Kinetic Energy will be nothing here, as Kinetic energy is the energy of an object by the virtue of it;s motion.

In short, Your Answer would be Option A

Hope this helps!

Answer 2

It is 0 J.

Step-by-step explanation:

Kinetic energy is the energy possessed by the body by virtue of its motion.

The formula of kinetic energy is given by

`K = (1)/(2)* m* v^(2)`

As the rock is suspended 320 m above the ground, so, the rock is not in motion.

It means that the speed of rock is zero.

So, by using the formula of kinetic energy

K = \frac{1}{2}\times m\times 0^{2}

K = 0 J