1. If a 49.6 g egg is dropped from 1.30 m above a floor, what is the minimum contact time with the floor to save the egg if it takes 25.5 N to break it?

2. A tennis play serves a 56.0 g ball from one end of the court to just inside the boundary at the other end (23.7 m) in 0.426 s. You can assume that the ball starts from rest just before being hit by the racket and given only a horizontal initial velocity. If the contact time between the ball and the racket is 30 ms, how much force does the racket put on the ball?

3. A 70 kg robber on inline skates grabs a bag of money. As he is skating backwards at 12.0 m/s he notices being chased by bicycle cops. He throws the bag with a speed of 5.0 m/s towards the cops which increase the robber's speed to 17.8 m/s. What is the mass of the money?

4. A 250 kg bumper car with two people each with a mass of 60 kg is going 3.78 m/s when it hits the same type of bumper car with just one 50 kg person initially at rest. What are the final speeds of the two cars?

Write down the key words or phrases for the following problems (5&6). Make sure you list all needed starting equations. Donotfully solve the problem. Donotsolve the equation for the missing variable.

5. A hockey goalie is standing on ice. Another player fires a puck (m = 0.17 kg) at the goalie with a velocity of +65 m/s. If the goalie catches the puck with his glove in a time of 5.0 103 s, what is the average force (magnitude and direction) exerted on the goalie by the puck?

6. A two-stage rocket moves in space at a constant velocity of 4900 m/s. The two stages are then separated by a small explosive charge placed between them. Immediately after the explosion the velocity of the 1200-kg upper stage is 5700 m/s in the same direction as before the explosion. What is the velocity (magnitude and direction) of the 2400-kg lower stage after the explosion?