The amount of work done in lifting the sister to a height of 1.5m is approximately 147 J.
The height to which the sister of mass 10.0 Kg is lifted is 1.5m.
The work done to lift sister is given by,
W = MgH
Where,
M is the mass of the sister,
g is the acceleration due to gravity,
H is the height to which the sister as lifted,
The value of acceleration due to gravity of earth is 9.8m/s².
Now, putting all the values accordingly,
W = 10.0 x 9.8 x 1.5
W = 147 Joules.
So, the amount of work done in lifting the sister is 147 J.
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