Question

1. two tennis balls are thrown at each other. what is the change in momentum of each ball if they are both thrown with the same mass of 0.057 kg at 8 m/s and come to a complete stop?

Explanation:

Step1: Recall the formula for change in momentum

The formula for momentum is \(p = mv\). The change in momentum \(\Delta p=p_{final}-p_{initial}\). Given that the final velocity \(v_{final} = 0\) (comes to a complete stop) and initial velocity \(v_{initial}=8m/s\), mass \(m = 0.057kg\)

Step2: Calculate the change in momentum for one ball

\(\Delta p=(m\times v_{final})-(m\times v_{initial})\). Substitute \(m = 0.057kg\), \(v_{final}=0m/s\), \(v_{initial}=8m/s\)
\(\Delta p=(0.057\times0)-(0.057\times8)=- 0.456N\cdot s\)

Answer:

• 0.456 N·s