Question

A work of 4900 joule is done on road of mass 40 kg to lift it to a certain height. calculate the height through which the load is lifted.​

Answer 1

Answer:

h = 12.25 meters

Explanation:

40gh = 4900 J

g = 10

h = 49/4

h = 12.25 meters

Answer 2

Answer :

Work done in lifting the load = 4900J

Mass of road = 40kg

We have to find the height through which the load is lifted$.$

★ As per work-energy theorem, Work done is measured as the change of potential/kinetic energy of body.

Potential energy is a relative quantity. Therefore potential energy at reference point is taken zero.

➤ Potential energy of body of mass m at height h from reference point is given by

• U = mgh

⭆ W = ∆(PE)

⭆ W = mgh - 0

⭆ 4900 = 40 × 9.8 × h

⭆ h = 4900/392

⭆ h = 12.5m

HOPE IT HELPS