Question

if momentum of a body changes by 10% then KE changes by

Answer 1

Answer:

K.E=5%

Explanation:

K.E=mv^2/2

K.E=(mv)v/2

As P=mv, so

K.E=Pv/2

if P=10% then

K.E=10%v/2

K.E=5%v

Answer 2

Answer:

As momentum is mass x velocity.

EXPLANATION

So 10% increase in momentum means 10% increase in velocity.

So, if initial velocity is v, then new velocity is 1.1v

Thus initial K.E. Kï

=mv 2/2.

Final K.E. K f

=m(1.1v) 2

/2=1.21mv 2

/2=1.21K i

Change in K.E. is (K f −Ki)/Ki

=0.21=21%