Question

An object of mass 4 kg is raised to a height of 50 m above the ground. What is its potential energy?

Answer 1

Answer:

Pᴏᴛᴇɴᴛɪᴀʟ ᴇɴᴇʀɢʏ = -1960J

Explanation:

Gɪᴠᴇɴ:-

• Mᴀss= 4 ᴋɢ
• Hᴇɪɢʜᴛ = 50ᴍ
• Aᴄᴄᴇʟᴇʀᴀᴛɪᴏɴ ᴅᴜᴇ ᴛᴏ ɢʀᴀᴠɪᴛʏ = -9.8 (ᴀs ᴏʙᴊᴇᴄᴛ ɢᴏᴇs ᴀɢᴀɪɴsᴛ ɢʀᴀᴠɪᴛʏ)

Tᴏ ғɪɴᴅ:-

• Pᴏᴛᴇɴᴛɪᴀʟ ᴇɴᴇʀɢʏ

Fᴏʀᴍᴜʟᴀ ᴜsᴇᴅ = ᴘᴏᴛᴇɴᴛɪᴀʟ ᴇɴᴇʀɢʏ = MGH

ɴᴏᴡ ᴘᴜᴛ ᴛʜᴇ ɢɪᴠᴇɴ ᴠᴀʟᴜᴇs ɪɴ ғᴏʀᴍᴜʟᴀ

➪ᴘᴏᴛᴇɴᴛɪᴀʟ ᴇɴᴇʀɢʏ = 4×-9.8×50

= -98×20= -1960 J

______________________________________

✫Tʜᴀɴᴋs ғᴏʀ ǫᴜᴇsᴛɪᴏɴ ✫

Answer 2

Explanation:

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Class 11

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>>An object of Mass 40 kg is raised to a h

Question

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An object of Mass 40 kg is raised to a height of 5m above the ground what is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.

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Solution

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Given :

Mass of the object M=40kg

Height upto which it is raised h=5 m

Potential energy P.E=Mgh

P.E=40×10×5=2000J

Let its kinetic energy be E

k

when it is half way down i.e h

′

=

2

h

According to conservation of energy,

K.E

i

+P.E

i

=K.E

f

+P.E

f

0+2000=E

k

+Mg

2

h

∴ 2000=E

k

+40×10×

2

5

⟹E

k

=1000J