Question

. Two balls of masses m1 and m2 are having speeds v1 and v2 respectively in opposite directions. Identify the

correct relation for the magnitude of net momentum for the system. [1]

(1) m1v1 + m2v2 = Constant (2) m1v1 – m2v2 = Constant

(3) m1v2 + m2v1 = Constant (4) m1v2 – m2v1 = Constant​

Answer 1

Answer:

External force = F

ext

=

Δt

Δp

=((m

1

v

1

′

+m

2

v

2

′

)−(m

1

v

1

+m

2

v

2

))/2t

0

−0

((m

1

v

1

′

+m

2

v

2

′

)−(m

1

v

1

+m

2

v

2

)=2t

0

F

ext

=2to(m

1

+m

2

)g

Answer 2

Answer:

1st option is correct

i.e m1v1+ m2v2 is constant