Question

What will be the new kinetic energy of a body if its velocity is doubled?

Answer 1

Dear Student,

The answer by Sanskriti Srivastava was right but the the student didn't expressed it in terms of Kinetic energy.

K.E = 0.5 mv² (1),


When the velocity of the body is doubled
K.E' = 0.5 m(2v)² = 4 (0.5mv²) or

K.E' = 4K.E (2)

i.e., when the velocity of a body is doubled its kinetic energy increases by four times.



Regards