AP EAMCET202124 Aug 2021Morning ShiftPhysicsWork, Power and EnergyActual
When the mass and speed of the body are doubled, the kinetic energy of the body
Options
- Abecomes double
- Bbecomes four times
- Cbecomes eight times
- Dremains unchanged
Correct answer
C. becomes eight times
Step-by-step solution
Given that, the mass and speed of body are doubled. Then, final kinetic energy, KE _f= 1 2 (2 m)(2 v)^2= ( 1 2 m v^2 ) 8 where, m and v are initial mass and speed. Here, initial kinetic energy, KE _i= 1 2 m v^2 KE _f=8 KE _i