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? (Formula: PE = mgh)

90 J
56.8 J
441 J
882 J

Answer 1

Given:-

• Height of slope ,h = 2 m

• Mass ,m = 45 kg

To Find:-

• Potential Energy ,PE

Solution:-

As we know that the energy possess by body due to its position is called Potential Energy.

Also, The acceleration due to gravity is 9.8m/s²

• PE = mgh

where,

PE is the Potential Energy

m is the mass of body

g is the acceleration due to gravity

h is the height

substitute the value we get

→ PE = 45 × 9.8×2

→ PE = 90×9.8

→ PE = 9×98

→ PE = 882 J

Therefore, the potential energy is 882 Joules.

Answer 2

Answer :-

Given :-

• Height of slope = 2 m
• Mass of sled = 45 kg

To find :-

• Potential energy - PE

Solution :-

• h = 2 m
• m = 45 kg
• g = 9.8 m/s²

Substituting the value in formula :-

P.E. = mgh

P.E. = 2 × 45 × 9.8

P.E. = 882 J

Potential energy = 882 J

Additional information :-

Potential energy is the energy possessed by a body by virtue of its position or deformed shape.

Types of Potential energy -

• Gravitational potential energy :-

The energy possessed by a body by virtue of its position is known as gravitational potential energy.

• Elastic Potential energy :-

The energy possessed by a body by virtue of the deformed shape is known as elastic potential energy.