1. The big fish is 4 kg, the little fish is 1 kg. The big fish moves towards the little fish, which is stationary, witha velocity of 5 km/hr to the right. Once the big fish eats the little fish what is the velocity of the big and the little fish together?

What concept or physics principle is involved ?

How would you separate the initial and the final situations?

How would you write the appropriate quantities and form an equation?

How to solve the problem?

2. A car of mass 1000 kg rearends a truck of 3000 kg. The car's velocity to the right is 20 m/s, the truck is stationary. Once the car hits the truck the truck moves to the right with a velocity 10 m/s. What is the velocity of the car?

What concept or physics principle is involved ?

How would you separate the initial and the final situations?

How would you write the appropriate quantities and form an equation?

How to solve the problem?