A 20. kilogram object strikes the ground with 1960 joules of kinetic energy after falling freely from rest. How far above the ground was the object when it was released?
1 Answer
9.8 metres
Explanation:
The Kinetic energy of an object at a point of its motion is =
Where,
m = mass of the body
and v = instataneous velocity of the body at that point
So, According to the question,
As the direction of the velocity was same as the direction of the acceleration due to gravity, we will take the answer as positive.
Now, According to the Equations of motion,
Now,