Question

In which type(s) of collision is/are both the total momentum before and the total momentum after the collision equal to zero?

a. hit and stick and explosion

b. explosion

c. hit and stick

In which type(s) of collision is/are the total momentum before the collision equal to the total momentum after the collision?

a. hit and stick

b. hit and rebound

c. explosion

d. all of the above

Answer 1

If there is no external force acting on system then initial and final momentum will be conserved

a)

Before hit there is a moving object,

So initial momentum is not zero

b)

Before explosion initial momentum is zero, so according to law of conservation of momentum, final momentum will also be zero

c)

Same as (a)

So correct option is (b)

According to law of conservation of momentum, initial momentum will always be equal to final momentum

So correct option is (d)