MHT CET202014 Oct 2020Morning ShiftPhysicsLaws of MotionActual
A body initially at rest is acted upon by a constant force (F) for time (t). The kinetic energy at time t is
Options
- AF ² t ² ~m
- B( Ft m )²
- CFt 2 ~m
- DF ² t ² 2 ~m
Correct answer
D. F ² t ² 2 ~m
Step-by-step solution
acceleration a = F m At time t, velocity v = at = Ft m Kinetic energy = 1 2 mv ²= 1 2 ~m F ² t ² ~m ² = 1 2 F ² t ² ~m