1. A rock is dropped from the edge of a cliff.  If the initial velocity of the rock was zero and if air resistance can be neglected, calculate the velocity of the rock two seconds after it is released.   ans0301 (36.0K)

2. Calculate the displacement of the rock in Problem 1 two seconds after it is released.   ans0302 (36.0K)

3. If the rock in Problem 1 had been thrown downward with an initial speed of 5 m/s calculate its velocity two seconds after it was released.   ans0303 (3.0K)

4. Calculate the displacement of the rock in Problem 3 two seconds after it is released.   ans0304 (38.0K)

5.  If the rock in Problem 1 had been thrown upward with an initial speed of 5 m/s calculate its velocity two seconds after it was released.   ans0305 (38.0K)

6. Calculate the displacement of the rock in Problem 5 two seconds after it is released.   ans0306 (38.0K)

7. A car starts from rest with a constant acceleration of 2 m/s².  Calculate its speed after 3 seconds.   ans0307 (32.0K)

8. Calculate the displacement of the car in Problem 7 after 3 seconds.   ans0308 (33.0K)

9. A car moving with an initial velocity of 20 m/s slows down at a rate of  3 m/s².  Calculate its speed after 4 seconds.   ans0309 (34.0K)

10. A major league pitcher can throw a baseball at a speed of 90 miles/hour (40.2 m/s).  Home plate is located 60 feet 6 inches (18.44 m) from the pitcher's mound.  A baseball announcer claims that the pitch traveled on a straight line path to home plate because it was thrown so fast.  Show that his claim is wrong by calculating how far the ball drops in its trip to home plate.   ans0310 (50.0K)