Question

A ball is dropped from a height of 10 m.
(a) Its potential energy increases and kinetic energy decreases during the falls.
(b) Its potential energy is equal to the kinetic energy during the fall.
(c) The potential energy decreases and the kinetic energy increases during the fall.
(d) The potential energy is ‘O’ and kinetic energy is maximum while it is falling.

Answer 1

Answer:

A ball is dropped from a height on 10m.

Explanation:

Now this is a assumption that the ball has not yet reached the ground level, as it is still falling down. This is because you have mentioned that it has been dropped, but not at the ground level.

So we will answer  this question on the fact that it is still falling down.

Now second thing that you need to keep in mind is that a ball will have both Potential and Kinetic energy. But there is a big difference between the two types of energy. PE is the energy that is possessed by the body by virtue of its position. So PE at height will be more than the PE by the same body at the ground level.

Again the KE is the energy that is possessed by the body by virtue of its motion, so a fast moving body will have higher KE as compared to one that is at rest.

But here the case is that the ball has been dropped, so it is obvious that the height factor here is decreasing and so the PE of the ball at every instance of travel will also decrease. Now the KE is either increasing (if it just began to drop) and will reach stability under gravity effect. So the moment you drop a ball from a height, and till it reaches the ground, its PE energy decreases while its KE is increasing till it reaches the ground level, where its PE is zero while KE just before touching the ground is maximum.

So here the correct answer is option C the PE is decreasing and its KE is increasing.  

Answer 2

Answer:

simple as hell is this-

the answer is c