Question

An object of mass 2kg raised to a height 10m possess potential energy of 200J. What is the kinetic energy and potential energy at a height 4 metre? ​

Answer 1

given:-

An object of mass 2kg raised to a height 10m possess potential energy of 200J.

to find:-

What is the kinetic energy and potential energy at a height 4 metre?

solution:-

from energy conservation,

potential energy at 10m height =potential energy +kinetic energy at 4 m

potential energy at 10 m height=200

let,Kinetic energy at 4m=KE

potential energy at 4m=PE

so,

• 200=KE+PE

potential energy at 4m height =

• mgh
• 2×10×4
• 80

Hence,

kinetic energy at 4m is =200-80=120J

Answer 2

Step-by-step explanation:

`{\bold{\sf{\underline{Understanding \: the \: concept}}}}`

✠ This question says that there is an object and its mass is 2 kg ; it's raised to a height 10 m and possess potential energy of 200 J. Now this question ask us to find the kinetic energy and the potential energy at a height 4 metre.

`\bold{↬{ }}`
`{\bold{\sf{\underline{Given \: that}}}}`

✰ Mass = 2 kilograms

✰ Raised height = 10 metres

✰ Posses potential energy = 200 Joules

`\bold{↬{ }}`
`{\bold{\sf{\underline{To \: find}}}}`

✰ Kinetic energy at a height 4 metre

✰ Potential energy at a height 4 metre

`{\bold{\sf{\underline{Solution}}}}`

✰ Kinetic energy at a height 4 metre = 120 J

✰ Potential energy at a height 4 metre = 80 J

`{\bold{\sf{\underline{Using \: concepts}}}}`

✰ Potential energy formula.

`{\bold{\sf{\underline{Using \: formula}}}}`

✰ Potential energy = mgh

`{\bold{\sf{\underline{We \: also \: write \: these \: as}}}}`

✰ Potential energy as P.E

✰ Mass as m

✰ Joules as J

✰ Height as h

✰ Raised height as g

`{\bold{\sf{\underline{Full \: solution}}}}`

✠ Let us find the Potential energy.

↦ Potential energy = mgh

↦ Potential energy = 2 × 10 × 4

↦ Potential energy = 20 × 4

↦ Potential energy = 80 J

✠ Now according to the question let us find the kinetic energy

↦ Kinetic energy = Posses potential energy - Finded potential energy

↦ Kinetic energy = 200 J - 80 J

↦ Kinetic energy = 120 Joules