(Take g=10 N kg-1).
Solutions:
According to the question, mass of the boy is 25kgf and height of the floor from the ground is 3m and ground ia at a height of 9m.
Expression for the Force of gravity on boy is mg
Therefore, Force = 25 × 10 = 250 N
Now, the increase in gravitational potential energy is given by the expression –
Mg (h2 – h1)
= 250 × (9 – 3) = 250 × 6
=1500 J