Question

Prelecture Concept Question 7.06 Part A An object weighing 20 N moves horizontally toward the right a distance of 5.0 m. What is the work don O The work done on the object by the force of gravity is 100 J O The work done on the object by the force of gravity is 4.0 J. O The work done on the object by the force of gravity is 0.25 J O The work done on the object by the force of gravity is 50 J O The work done on the object by the force of gravity is zero joules. Submit My Answers Give Up

Answer 1

Force of gravity is along verticalyy down wards.

Displacment is laong horizontal.

i.e., force of gravity and displacment are perpendicular to each other

So, angle between force of gravity and displacment is $\theta$ = 90 ^o

Therefore work done = F.S

                             = FS cos $\theta$

                            =FS cos90

                            = 0    SInce cos90 =0

last option is correct