General Knowledge - Physics - Discussion

In this case momentum=m*v

Here v is 0 so if mass m1 is 3 and m2 is 4 but v is 0.

So momentum remains constant.

Second law of motion by newton will greatly explained it.

If the ans is not velocity then definitly not option B.

Because P=mv. if v changes then how can p same in both cases.

Assume case 1;
m=1kg v=1m\s then p=1kgm\s

Assume case 2;
m=2kg v=2m\s then p=4kgm\s.

All options are not satisfactory.

Force=rate of change of momentum.

As force & time both are constant. So we get momentum=constant.

momentum = force* time

1)According to newton,s 2nd law force = rate of change of momentum i.e.,momentum=m*v

F= M*(D*V/DT)=M*A

so it is case of m1v1 and m2v2

m1 is not = m2

hence v1 is not = v2

now Newton's 3rd law come in pictutre during impact

F1=F2 ......(equal and opposite reaction)

hence m1a1=m2a2

momentum1=momentum2

2)

it can be a case of special relativity

increase in velocity= increase in inertia = increase in enrgy

then apply law of conservation of energy again newtons 3rd law

3)

concider it is case of closed system between two bodies

u get the answer