Question

2 identical ball each of mass 4 kg are moving toward each other with speed 2 m/s and 3 m/s respectively . they undergo head on perfectly elastic collision then impulse imparted by one ball on other is
1) 12Ns
2) 8Ns
3) 20NS
4) 40Ns

Answer 1

Impulse = m(v2-v1)

V2 = 3m/s

V1 = - 2m/s

Then,

Impulse = 4*[3-(-2)] = 20 Ns

Answer: Correct option 3)

Answer 2

Explanation:

the impulse imparted by one ball on other is 20Ns