Question

Before colliding , the momentum of Block A is +450 kg^ * m/s , and Block Bis -150 kg^ * m/s . After , Block A has a momentum +100 kg*m/s. What is the momentum of Block B afterwards ?

Answer 1

Answer:

Momentum of Block B after collision  is 200 kg.m/s

Explanation:

Momentum of block A before collision is $p_{1A} = 450kg.m/s$

Momentum of block B before collision is $p_{1B} = -150kg.m/s$

Momentum of block A after collision is $p_{2A} = 100kg.m/s$

According to conservation of momentum, total momentum before collision is equal to total momentum after collision

$p_{1A}+p_{1B}=p_{2A}+p_{2B}\\450-150=100+p_{2B}\\p_{2B}=300-100\\p_{2B}=200 kg.m/s$

Momentum of Block B afterwards is 200 kg.m/s