Question

a ball of mass 2kg moving with a speed of 20m/s stops after hitting with 10kg mass which is rest .what will be the speed of 10kg mass after elastic collision​

Answer 1

Answer:

According to Conservation of momentum, it must be equal before a reaction and after a reaction and momentum is the product of mass and velocity. So,

m1v1=m2v2……………………….(1)

Explanation:

Moving objects only have momentum.

So,

m1v1= 2kg* 20 m/s

Momentum after reaction,

m2v2= 10kg* v2

By putting values in eq (1)

m1v1=m2v2

2*20=10*v2

V2=2*20/10

V2=4 m/s

So, speed of 10 kg mass after elastic collision is 4 m/s.