Question

find the potential energy gained by 7 kg weight if lifted 20 m vertically

Answer 1

Answer :-

The potential energy is 1372J.

Step-by-step explanation:

To Find :-

• The potential energy gained by 7kg weight, lifted 20m vertically.

★ Solution

Given that,

• Mass of the body = 7kg
• Height lifted = 20m vertically.

We know,

Potential energy = mgh

Where,

• m = Mass
• g = Acceleration due to gravity
• h = Height

And

Acceleration due to gravity = 9.8 m/s²

Therefore,

⇒ mgh

⇒ m × g × h

⇒ 7 × 9.8 × 20

⇒ 140 × 9.8

⇒ 1372 J

Hence, Potential energy is 1372J.

Formula used :-

Potential energy [P.E.] = mgh.

Answer 2

Answer:

1400J is the potential energy.

1372J if  g = 9.8

Explanation:

Potential Energy = m x g x h (assuming g = 10m/s^2)

                            = 7  x 10 x 20

                            = 200 x 7 = 1400J

P.E = mgh (taking g = 9.8m/s^2)

     = 7 x 9.8 x 20 = 1372 J