Class 11 NEET Physics Work, Energy and Power Questions

Let m be the mass of the body and v1 and v2 be the initial and final velocities of the body respectively.
∴ Initial kinetic energy =

1

2

mv12
Final kinetic energy =

1

2

mv22
Initial kinetic energy is increased 300% to get the final kinetic energy.
∴‌

1

2

mv22=

1

2

(1+

300

100

)mv12
⇒v2=2v1 or

v2

v1

=2 .....(i)
Initial momentum =p1=mv1
Final momentum =p2=mv2
∴

p2

p1

=

mv2

mv1

=

v2

v1

=2
∴ p2=2p1=(1+

100

100

)p1
So momentum has increased 100%.