Question

8. If the mass of a body is doubled, its K.E is
a. Remains the same
c. becomes half
b. gets doubled
d. None of these​

Answer 1

Kinetic energy of a body of given mass, is directly proportiional to its square of its velocity. When momentum is doubled, mass remaining constant, this means velcity is doubled. Hence, kinetic energy becomes 22=4 times i.e. say from 100 units to 400 units. and percentage increase in kinetic energy is 400−100=300% .

Answer 2

Answer:

KE = 1/2 m*v^2

: as m is directly proportional to K. E

AND

del. Ke=del. 1/2 m

Threfore KE also gets doubled.....