Question

A man of mass 50 kg climbs up a ladder of height 10 m. Calculate: (i) the work done by the man, (ii) the increase in his potential energy. (g = 9.8 m s^-2)

Answer 1

Mass of man = 50kg

Height of ladder, h₂ = 10m

(i) Work done by man = mgh₂

= 50 × 9.8 × 10 = 4900J

(ii) increase in his potential energy:

Height,h₂ = 10m

Reference point is ground, h₁ = 0m

Gravitational potential energy = Mg (h₂-h₁)

= 50 × 9.8 × (10-0)

= 50 × 9.8 × 10 = 4900J