A particle which is experience a force, given by undergoes a displacement of . If the particle had a kinetic energy of 3J at the begning of the displacement, What is its kinetic energy at the end of the displacement?
10 J
9 J
15 J
12 J
Definition of work by constant force -
w =
- wherein
The scalar product of the force vector () and the displacement vector ()
Net work done by all the forces give the change in kinetic energy -
- wherein
W = F.d = 3X4 =12J
12 = Kf -3
Kf = 15J
10 J
Option 2)9 J
Option 3)15 J
Option 4)12 J
Study 40% syllabus and score up to 100% marks in JEE