Answer:
Work done in lifting the object = 98 J
Explanation:
Work: Work can be defined as the product of force and distance.
The S.I unit of work is Joules (J).
Mathematically it can be expressed as
W = F × d................. Equation 1
Where W = work done, F = force needed to lift the object, d = distance
The gravitational force on the object = Weight of the object
Weight of the object = mg .................. Equation 2
Where m = mass of the object, g = acceleration due to gravity
Given: m = 5 kg,
Constant: g = 9.8 m/s²
Substituting these values into equation 2
Weight of the object = 5 × 9.8
Weight of the object = 49 N
Since weight of the object = force needed to lift the object,
F = 49 N
Also Given: d = 2 m
Substituting these values into equation 1
W = 49 × 2
W = 98 J
Work done in lifting the object = 98 J
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