In the image, there are four problems written on two whiteboards. Please extract the given information and the question for each problem and format it as a JSON object.

Problem 1

Дано:

• h = 20 см
• m = 200 г

Найти:

• E_p = ?

Problem 2

Дано:

• E_p = 100 Дж
• m = 10 кг

Найти:

• h = ?

Problem 3

Дано:

• F = 2 кН
• h = 2 км

Найти:

• A = ?

Problem 4

Дано:

• A = 70 кДж
• h = 10 м

Найти:

• m = ?

Formulas Provided:

• E_k = rac{mv^2}{2}
• E_p = mgh