Question

What is the potential energy of a girl who weighs 70 N standing on a stairs with height of 400 cm?

Answer 1

Answer:-

• The potential energy of the Girl = 280 J

Explanation:-

Given:-

• Weight of Girl standing on stairs, W = 70 N
• Height of stairs, h = 400 cm = 400/100  m = 4 m

To find:-

• Potential Energy of Girl, P.E. =?

Knowledge required:-

• Formula for weight of the body

        W = m g

• Formula for Potential energy

        U = m g h

[ Where W is weight, m is mass, g is the acceleration due to gravity, h is the height, U is potential energy ]

Solution:-

Given the weight of the body as 70 N

therefore, Using the formula for weight of the body

→ W = 70 N

→ m g = 70 N

Now, Using the formula for Potential energy

→ U = m g h

→ U = ( m g ) h

→ U = 70 N × 4 m

→ U = 280 Nm = 280 J

Therefore,

• The Potential energy of the girl will be 280 Joules.