Potential Energy of an Object at a Height

Q.

A ball is thrown from the top of a building. As it approaches the ground which of the following decreases?

1. Kinetic energy

2. Both kinetic and potential energy

3. Potential energy

4. Mechanical energy

Q.

What would be the gravitational potential energy of an object whose mass is $\text{1 kg}$ and is at a height of $\text{10 m}$?

1. 10J

2. 98J

3. 50J

4. 49J

Q.

During a race, you are accelerating on a leveled track and acquire a velocity three times your initial velocity. What is the change in your potential energy?

1. It becomes 3 times that of your initial potential energy.

2. It becomes 9 times that of your initial potential energy.

3. It does not change.

4. It becomes 1.5 times that of your initial potential energy.

Q.

A kid pushes his toy of weight 100 grams along a distance of 5 m on the floor. He applied force of magnitude 9 N. What is the work done by the kid to displace the toy? Is there any change in potential energy possessed by the toy?

1. 4.5 J with no change in potential energy

2. 45 J with no change in potential energy

3. 45 J with a change in potential energy

4. 4.5 J with a change in potential energy

Q. Find the potential energy possessed by an object of mass 10 kg when it is at height of 6 m above the ground. Take acceleration due to gravity $g=10m{s}^{-2}.$

1. 1000 J
2. 300 J
3. 600 J
4. 100 J

Q.

When two different stones of masses $\text{1 kg}$ and $\text{2 kg}$ are taken to the same heights, then:

1. The potential energy of the stone of mass 1 kg is more than that of the 2 kg stone.

2. The potential energy of the stone of mass 2 kg is more than that of the 1 kg stone.

3. Cannot be judged with the given information.

4. The potential energy of both the stones would be the same.

Q.

To what height should an object of mass $2kg$ be raised so that its potential energy is $980J$?

1. 50 cm

2. 100 m

3. 50 m

4. 100 cm

Q.

Two boys were playing with a ball on a level ground. One of the boys throws the ball on the third floor of the building which is at a height of 5 m and the other boy manages to throw on the fourth floor which is at a height of 7 m from the level ground. Find the ratio of the work done by both the boys?

1. 1: 1

2. 5: 7

3. 3: 2

4. 2: 3

Q.

When a lift is going up, the potential energy of the person with respect to earth inside a lift remains the same.

1. True

2. False

Q.

An arrow fired from a bow attains a maximum height of $5m$ from the level it is released. If the mass of the arrow is $500grams$, work done by the bow on arrow is greater than which of the following? (Assume, $g=10m{s}^{-2}$)

1. 20J

2. 25J

3. 30J

4. 35J