Question

To what height should a body of mass 5 kg be raised so that its potential energy is 490 J? [g = 9.8 m/s² ]

Answer 1

The potential energy due to gravitation is given by 

P.E = mgh 

Where, m = Mass, 

G = acceleration due to gravity, 

H = height, 

Given 

Mass = 5 Kg, 

P.E = 490 J, 

G = 9.8m/s² . 

H =?

490 = 5 × 9.8 × h

⇒ h = \(\frac{490}{9.8\times5}\) = \(\frac{490}{49}\) = 10 m

Hence the body should be raised to 10 m