Question

Internal forces acting within a system of particles
can alter
(1) The linear momentum as well as the kinetic
energy of the system
(2) The linear momentum of the system, but not the
kinetic energy of the system
(3) The kinetic energy of the system, but not the
linear momentum of the system
(4) Neither linear momentum nor kinetic energy of
the system​

Answer 1

Answer

(3) the kinetic energy of the system but not the linear momentum of the system

Explaination

in any closed system with only conservative forces, mechanical energy is conserved.kinetic energy is not conserved .

on the other hand

momentum F external=dp/dt

if External Force =0 then dp vector=0

we can say that ∆p vector =0

which implies that initial momentum=final momentum.

So if the net external force on a system of particles is zero then net momentum of the system will remain conserve.