science

Grade6

Easy

Question

# A plane of mass 300 kg and a cargo plane of mass 30000 kg; which one has more potential energy if the height of planes flying is the same?

- Plane
- Cargo plane
- Air
- None

Hint:

### Potential energy= mass x gravitational acceleration x height.

## The correct answer is: Cargo plane

### Given,

mass of plane = 300kg

mass of cargo plane = 30,000kg

Let, the height of both the plane and cargo plane be h

According to the formula,

Potential energy= mass x gravitational acceleration x height.

Potential energy of plane (PE_{p}) = 300 x g x h

PE_{p} = 300gh (equation -1)

Potential energy of cargo plane (PE_{c}) = 30,000 x g x h

PE_{c} = 30,000gh (equation -2)

From above two equations, we can say that the potential energy of the cargo plane is more than the potential energy of the plane.

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