Question

A crane at a construction site lifts a concrete block with a mass of m = 344 kg from the ground to the top of a building with a height of h = 18.3 m. How much work did the motor of the crane do? (Assume zero energy loss in the lifting mechanism due to friction.)

Answer 1

Answer: Work that the motor of the crane do is 61122 joules.

Explanation:

Work is defined as the force resulting into displacement of an object.

$w=m\times g\times h$

w = work done

m= mass of object = 334 kg

g = acceleration due to gravity = $10ms^{-2}$

h = height of an object  = 18.3 m

Putting in the values:

$w=334\times 10ms^{-2}\times 18.3m=61122Joules$

Thus work that the motor of the crane do is 61122 joules