Question

How much is the weight of a man if he has to do 2500 joules of work in climbing a tree 5 centimetre tall g = 10m / s2
Pls answer this question

Answer 1

Answer :-

Mass of man = 50 kg

_________________________

Explanation :-

Given:-

• Potential energy (P) = 2500 J
• Height of tree (h) = 5 m
• According due to gravity (g) = 10 m/s²

Find:-

• Weight of the man.

Solution:-

Energy possesed by an object due to change in it's shape or position is known as Potential energy.

• It is denoted by U.
• It's S.I. unit is joule (J).

And in above question, the man change his position to do the work. The energy possesed by him is knwon as Potential energy.

$\sf{Potential \:energy \:=\:mass\:\times\:acceleration \:due}$ $\sf{to\:gravity \:\times\:height}$

OR

$\sf{U\:=\:mgh}$

Substitute the known values in above formula

$\implies \:2500\:=\:m\:\times\:10\:\times \:5$

$\implies \:2500\:=\:m\:\times\:50$

$\implies \:\frac{2500}{50}\:=\:m$

$\implies \:50\:=\:m$

$\implies \:m\:=\:50$

•°• Mass of the man is 50 kg

Answer 2

$\huge\sf{Answer:-}$

Given:-

How much is the weight of a man if he has to do 2500 joules of work in climbing a tree 5 centimetre tall g = 10m / s2

Find:-

The weight of the man.

Hence:-

Note That :-

• Let U be the Denoted and Joule be the SI unit.

• Let (J) be the joule.

[Formula]

Potential energy = mass × acceleration of gravity × height.

Adding values

$\sf = 2500 = m \times 10 \times 5 \\ = 2500 = m \times 50 \\ \sf = \frac{2500}{50} = m \\ \sf = 50 = m \\ \sf m = 50$

Therefore, 50kg is the weight of the man.

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