Question

Calculate the potential energy gained by a man weighing 50 kg in climbing up a ladder 15 m high.(g=9.8m/s^2)

Answer 1

Answer:

Potential energy = mgh where m stands for mass g stands for gravity and h stands for height

putting the values in formula

Pe =mgh

Pe =50 * 9.8 * 15

Pe =7350 joules

Answer 2

Given

• Weight of man = 50 kg
• Gravitational acceleration (g) = 9.8 m/s²
• Height = 15 m

To find

• Potential energy gained.

Solution

From the data we have ;

Weight or Mass (M) = 50 kg

g = 9.8 m/s²

h = 15 m

As we know that,

⟼ Potential energy (P.E.) = m × g × h

Substituting values,

⟼ P.E. = 50 × 9.8 × 15

⟼ P.E. = 490 × 15

⟼ P.E. = 7350 J

⟼ P.E. = (7350/1000) kj

⟼ P.E. = 7.35 kj

∴ Potential energy gained by man = 7350 Joules / 7.35 Kilojoules.

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Another formula related to it :

⇒ Kinetic energy (K.E.) = ½ mv²

Where,

⟼ m denotes mass

⟼ v denotes velocity