Question

a box of mass 70 kg is lifted up to a certain height h above the ground.if the potential energy of box is 2744 J, tell the height at which the object is with respect to ground?​

Answer 1

Answer:

4m

Explanation:

Gravity=9.8m/s^2

Mass=70kg

Height=h.

Potential energy=2744J.

we know that, potential energy=Mass×Gravity×Height

therefore, 2744J=70x9.8×h.

2744J=686×h.

2744/686=h.

4m=h.

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Answer 2

$\large{\bold{Aɴsᴡᴇʀ :}}$

$\:$

$\sf{\:\:\:●\:Height\:(h)=}$$\textsf{\textbf{\red{4m}}}$

$\:$

$\large{\bold{Gɪᴠᴇɴ :}}$

$\:$

$\sf{\:\:\:●\:Mass\:of\:box\:(m) = 70\:kg}$

$\sf{\:\:\:●\:P.E\:(at\:height\:‘h’) = 2744\:J}$

$\:$

$\large{\bold{Tᴏ \:Fɪɴᴅ :}}$

$\:$

$\sf{\:\:\:●\:Height\:(h)}$

$\:$

$\large{\bold{Fᴏʀᴍᴜʟᴀ\: Usᴇᴅ :}}$

$\:$

$\sf{\:\:\:●\:}$$\boxed{\sf{\color{navy}{P.E = mgh}}}$

$\:$

$\large{\bold{Sᴏʟᴜᴛɪᴏɴ :}}$

$\:$

➻ $\sf{P.E = mgh}$

➻ $\sf{2744 = 70\times 9.8\times h}$

➻ $\sf{h = \dfrac{2744}{686}}$

➻ $\textsf{\textbf{h = 4m}}$