Question

3. A child lifts a book of mass 1 kg from the table to a cupboard at a height of 2 m from the
floor. What is the potential energy of the book with respect to the floor?​

Answer 1

Answer:

potential energy = mass × acceleration due to gravity × height

therefore , p.e = 1×9.8×2= 19.6 kg m/s²

Answer 2

Answer:

20 joules

Explanation:

GIven:

• Mass of the book = m = 1 kg
• Height to which the book is lifted = h = 2 metres
• Gravitational force = g = 10 m/s

To find:

• Potential energy of the book with respect to the floor

Potential energy = mass × gravitational force × height

Potential energy = 1 × 10 × 2

Potential energy = 10×2

Potential energy = 20 Joules

The potential energy possesed by the book with respect to the floor is equal to 20 joules