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:
275 J
250 J
475 J
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