Question

A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sled’s potential energy?

Answer 1

Given

• There is a sled in rest
• Height = 2 m
• Mass = 45 kg
• Gravitational Acceleration = 10 m/s²

To Find

• Potential Energy of the sled

Solution

● Potential Energy of a body is the energy that a body has due to its position, it is given by the formula, Eₚ = mgh

✭ Potential Energy of the body :

→ Eₚ = mgh

• m = Mass = 45 kg
• g = Gravitational Acceleration = 10 m/s²
• h = Height = 2 m

→ Eₚ = 45 × 10 × 2

→ Eₚ = 450 × 2

→ Eₚ = 900 J

∴ Potential Energy of the sled is 900 J

Answer 2

Answer:

Explanation:

Given,

Height, h = 2 m

Mass, m = 45 kg

To Find,

Potential energy

Formula to be used,

PE = mgh

Here, PE = Potential energy,

m = Mass,

h = Height and,

g = Acceleration due to gravity i.e 9.8 m/s²

Solution,

Putting all the values, we get

PE = mgh

⇒ PE = 45 × 9.8 × 2

⇒ PE = 882 J

Hence, the sled’s potential energy is 882 J.