#### A block of mass 10 kg, moving in x direction with a constant speed of 10 ms-1, is subjected to a retarding force F = 0.1 x J/m during its travel from x = 20 m to 30 m. Its final KE will be: Option 1) 275 J Option 2) 250 J Option 3) 475 J Option 4) 450 J

As we discussed in

Net work done by all the forces give the change in kinetic energy -

- wherein

Definition of work done by variable force -

- wherein

is variable force and is small displacement

w=

w=

-25 J+500 J = 475 J

Option 1)

275 J

Incorrect Option

Option 2)

250 J

Incorrect Option

Option 3)

475 J

Correct Option

Option 4)

450 J

Incorrect Option

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475J