Question

A body of mass 1kg has kinetic energy 4 joule if the velocity of the body increased by 50% then calculate the percentage change in kinetic energy?
pls give the answer quickly​

Answer 1

Answer:

engergy = workdone /force

Kinetic energy = W/F

workdone=mass ×velocity

=1kg×V

K.E=1V/F

KE'=1×0.5V×F

K.E=4

THEN,

4=V/F

K.e'=0.5V/F

cancell F on both K.E as they are equal

then,

4=V--------->1

K.e=0.5×V-------->2

substituting 1 in 2 we get

K.e'=0.5×4

K.e=2

Ke:Ke'

4:2

2:1

perctange of change in Kinetic energy=50%